I like the Chairman Meow stuff at:http://www.obeythepurebreed.com !

There are a lot of greats in this list. I can't get enough ICanHasCheezburger!
Two I didn't see are:
http://www.catnutrition.org/index.php and
http://www.catinfo.org/

Both of these actually came via my veterinarian and have proved very helpful over the years.

Other people have said some of the ones I was going to say (I'm a little late on this!) but there is one that has not been mentioned: http://www.hotdogblog.com

It's for people with dachshunds...there are actually quite a few dachshund sites, but this is the only one I frequent. It's definitely the community feel that keeps me coming back for more! There is a blog section, forums, chat, a cute pictures of dachshunds!

I like http://www.goodnewsforpets.com because the content is updated often and it offers current animal health news.

Iguana information: http://www.anapsid.org/

Rabbit information: http://www.rabbit.org/

Guinea pig information: http://www.guinealynx.info/

http://icanhascheezburger.com/

lolcat supersite.

For ferrets, http://miamiferret.org/fhc/ is an excellent, excellent resource (and right down in your neck of the woods, too!). The site provides a comprehensive and up to date overview of pretty much all the medical issues a ferret might face in its life, as well as some how-to articles about supportive care, recent news about ferret health, etc., and discussion forums.

www.obeythepurebreed.com
Hilarious Cafe Press products featuring numerous breeds. Plus mutts, cats & babies.

www.woof.com
www.petedge.com

http://nanookthenewfy.blogspot.com is one of my favs. It is fun with some education rolled in.

Paws and effect!

http://www.paws-and-effect.com/

The lady who runs this is very knowledgeable. She has her own blog on livejournal, but the website is the best way to get information.

www.pethobbyist.com

A collection of pet-related sites with something for everyone.

www.bestfriends.com a wonderful site for uplifting stories and tons of info from the amazing animal sanctuary in Utah.

Oh, and I forgot the ASPCA Poison Control Center (http://www.aspca.org/site/PageServer?pagename=pro_... and Hotline (888-426-4435). The fee is only if they transfer the info straight to your vet.

www.paws-and-effect.com - awesome cat-rearing advice.

WWW.DOGSTER.COM and while you're there check out Agadore and BeanerBoy

www.dogswithblogs.com.au
It technically a collection of over a hundred dogs with blogs which is the fun part. Its also a community where dog owners from all over the world join together to support and educate eachother both through the forum and through the individual blogs.

http://www.paws-and-effect.com/

Always had good luck with their advice and enjoyed their work.

Ok... PetConnection, Itchmo, Dolittler are all in my favorites, too. But I will contribute a little shameless self-promotion in http://www.pethobbyist.com as I have worked as a host with this group for nearly 10 years. Discussion forums, hosted chats, photo galleries and more for all species with individual sites for dogs, cats, etc as well as PetSupport.net for pet loss and RescueNetwork.org for rescue groups.

Oops - meant to say itchmo's blog is similar to pet connection.

I love www.paws-and-effect.com ! The woman who maintains it is an animal lover to the core, and much of the site is written from the perspective of her cats, yet still professionally. I have almost always been able to find answers to my questions on this site, and when I have sent in a question, I've found it answered very quickly! It's a great resource!

I am addicted to the forums on
www.dogster.com
www.catster.com
Lots of discussion, ideas, problem-solving, and the occasional heated argument, all from other animal-lovers.

Ooooh we're off to a great start! I have to say I've never seen some of these! And I loooove terrierman for its sheer geekiness (and that's a compliment). I'm off to animalblawg right now.

Oops!

I can't believe I forgot!

www.stuffonmycat.com and www.stuffonmymutt.com!

My favorite site hands-down is doolittler (and I'm not just sucking up - the writing is well done and the updates aren't in a deluge (like itchmo))...

But I also like animalblawg.com (cool site by two law students headed into animal rights law)
and
poshpuppyonline.com - that's a store, but i LOVE it.

I've tried visiting other pet sites, and well, let's just say I "accidently" deleted those links. The general "I'm better than you, Cesar Milan is the anti-christ, and even though my dog bites, he's well behaved" atttitude of these other sites drive me crazy. They shouldn't be pet sites, they would be better titled as cat-fight sites.*rolls eyes* Some of the other sites I hang out on have sections devoted to pets, but they are done in a forum fashion so there's also lots of other types of conversations to get involved in as well.

So as far as far as other pet sites go, I only visit yours and I don't order pet meds or anything else pet related online. If I'm looking for something, I may do a search online to see if a place carries it. This is always the case for a particular pet store on the Cape. If they don't have it posted on their website, I'll call them first as I refuse to spend hours sitting in Cape traffic just because I'm looking for one specific thing.

#1 -- Dolittler -- of course!

#2 -- Itchmo

Looking forward to everyone else's favorites, MB