here's what I've gotten from the eggs that I have so far:

Green Plaid: Inside this Spring Hunt Egg was 30 Flawed Orbs, 30 Simple Orbs and 1 SUPER|brie+!

Sharing:Inside this Spring Hunt Egg was 20 Scrap Metal and 6 SUPER|brie+!

Friendly: Inside this Spring Hunt Egg was 20 Flawless Orbs and 6 SUPER|brie+!

Caring: Inside this Spring Hunt Egg was 15 Luck Charms and 6 SUPER|brie+!

Stripy Red: Inside this Spring Hunt Egg was 10 Lucky Rabbit Charms and 2 SUPER|brie+!

Blue Argyle: Inside this Spring Hunt Egg was 1 Chocolate Bunny and 2 SUPER|brie+!

Wavy Purple: Inside this Spring Hunt Egg was 1 Umbrella and 3 SUPER|brie+!

Scalloped Pink: Inside this Spring Hunt Egg was 3 Ultimate Power Charms and 4 SUPER|brie+!

Golden: Inside this Spring Hunt Egg was 10 Ultimate Luck Charms and 20 SUPER|brie+!

36 Gift: Inside this Spring Hunt Egg was 18 Radioactive Blue Cheese Potions, 20 Gnarled Potions, 13 Splintered Wood, 5 Wicked Gnarly Potions, 8 Meteorite Pieces, 2 Greater Radioactive Blue Potions and 2 Runic Potions!

I've gotten a wide variety out of my eggs. Super Brie and a lot of potions. I'm going to have radioactive blue coming out of my ears for months! Virtually speaking of course. In addition to the eggs to get into the factory, I picked up a Whisker Woods egg and two Monster eggs. I've now got 6 Greater Radioactive Blue potions. They convert 66 brie at a time. 38 regular RB potions and 13 corrupted RB potions (I had these before the event).

I got 7-12 wicked gnarly potions and 26 gnarled potions. I'm going back to the Warpath to see if I can pick up one of those eggs. I'm going to go back to the woods tomorrow to see if I can get a cherry egg.

I've gotten the Whisker Woods egg so far. now trying to see if I can get some of the other ones too

I'm seeing a lot of people struggling with Hare Razer. I don't know if those same people are reading through this thread or not, but if you happen to see this post, here are some tips.

First of all, head over to Furoma.com's catch rate page. Play around with trap setups so you can see how they'll affect your catch rate percentages. Use the Mountain as a location on that page since the mice there are about the same level of difficulty as the event mice.
Hare Razer and the other mice can be caught with any trap type, so pick your most uber trap, it doesn't necessarily have to be physical or arcane.

Hare Razer setup:
Your Best Trap
Your Best Base
Dark Chocolate Charm
Marshmallow Monterey

You can get away with using a different charm if you want, Hare Razer can still be caught without it, but the Dark Chocolate Charm greatly increases his attraction.
However, you MUST use Marshmallow Monterey. I've seen a couple people saying they've been using SB to try to attract him and that won't work, so don't waste your SB here.

Good luck!

....

Well after some less-than-awesome luck with bonus egg hunting yesterday (gave up on getting a Cherry Egg and Monster Egg for now) I headed over to the Tribal Islands where the bonus eggs are far easier to come by provided you attract the right mouse. I have added the Nerg Egg and Derr Egg to my collection and should hopefully get the Elub Egg soon. Then it's onto the Pygmy Egg, Cove Egg and Dragon Egg.

finally got my golden egg! Now on to the chocolate factory...where do you get the cheese to catch the Hare mouse?

I got all mine through drops, Sarah. I think perhaps an egg or two is hiding the cheese as well. But I'm not certain. I'm fairly certain you can't buy it in the shops.

Okay, I figured it was dropped by mice. I guess I'll just wait!

Hurrah! I caught the Hare Razor Mouse! I thought I'd never get there. Egg smashing time!

Green Plaid: 30 Flawed Orbs, 30 Simple Orbs, 1 SuperBrie
Blue Argyle: 1 chocolate bunny, 2 SuperBrie
Sharing: 20 scrap metal, 6 SuperBrie
Caring: 15 luck charms, 6 SuperBrie
Stripy Red: 10 lucky rabbit charms, 2 SuperBrie
Wavy Purple: 1 umbrella (what? an umbrella?!?), 3 SuperBrie
Scalloped Pink: 3 ultimate power charms, 4 SuperBrie
Friendly: 20 flawless orbs, 6 SuperBrie
Golden: 10 ultimate luck charms, 20 SuperBrie
12 Gift Eggs: 1 greater radioactive blue potion, 3 runic potions, 2 radioactive blue potions, 6 meteorite pieces, 1 wicked gnarly potion, 4 gnarly potions, 5 splintered wood

Wow. I don't think I'll be selling my orbs for awhile. That whole supply and demand thing has probably gone into overdrive on the marketplace.

PR, the marshmallow monterey cheese is dropped by the 3 event mice in the Chocolate factory

as for the bonus eggs, I've gotten the Whisker Woods egg, the Cherry egg, and the Hydra egg so far. I'm trying to get the Dojo one, but not having much luck yet

Just a few updates from my journal:

1:30 am - Town of Gnawnia
I checked my trap and found that I had caught a mouse! I caught a 1 oz. Flying Mouse worth 450 points and 450 gold.

2:30 am - Town of Gnawnia
I checked my trap and found that I had caught a mouse! I caught a 2 oz. Nibbler Mouse worth 1,100 points and 900 gold.

The mouse also dropped the following loot:
1 Nibbler Egg

2:49 am - Town of Gnawnia
I received 4 SUPER|brie+ from 1 Nibbler Egg.

3:23 am - Town of Gnawnia
I sounded the Hunter's Horn and was successful in the hunt! I caught a 7 oz. Master Burglar Mouse worth 4,260 points and 2,500 gold.

The mouse also dropped the following loot:
1 Satchel of Gold (1,000 gold) and 1 Crown Jewel

11:30 am - Harbour
I claimed my order for 1 King's Gauntlet Floorplan from the merchant. The order took 1 hour.

Right now I'm back at the chocolate factory... after a few of the bonus eggs there.

okay. the Dojo egg is driving me insane... I've caught several students, and none of them have dropped the egg...

I just got the Pirate Egg and it had 1,000 gold in it!

Edit! I just got a second Pirate Egg with 5,000 g!

I keep ending up back in the Whisker Woods 'cause I like the loot in the eggs. It's good for tournys.

I've caught the Whisker Woods, Hydra, Dragon, Elub, Cove, Monster, Burglar, Cherry, Jungle of Dread, and Warpath eggs.

Am I right in thinking I need to have the event cheese to attract mice that drop special eggs, even in other regions?

Nope. It's the regional cheese.