A popular Internet phenomenon, Lolcats (pictures of cats with humorous captions) can be found all over the Internet. I found ten excellent Lolcat resources to get you prepared for the next Caturday. So here we go:

One of the most definitive of the lolcats phenomenon, pictures of cats with cute captions overfloweth on this site. Extremely impressive, there are over ninety pages to browse! Remember to bring a "cheezburger" with you.
This LiveJournal group's motto is, "Because EVERYDAY is Caturday". Lots and lots of lolcats at this website, as it is a popular group on LiveJournal. All-around a great lolcat resource.
This forum also has lots of lolcats in their directory; over 200, in fact. Excellent board layout, too.

Here's a great Canadian website covering all things lolcat. There are also videos, too! Makes me proud to be a Canadian, I tell you.
eBaum's world also had many lolcat pictures... there are nearly 100 pages of cats for your perusal.Very impressive!
Lots of lolcat pictures, and you can even vote on the pictures to raise their popularity.

Pichaus is a graphic image hosting site, and they have a great gallery of lolcats. Almost 80 pictures, in fact. There's some great funny lolcat pictures there.
The aim of this website is to show pictures of cats with objects placed upon them. Not all the pictures here follow that rule, but many do and the comedy may commence.
You may have to scroll down a bit to get to the pictures, but it's worth it because there are a LOT of lolcats here.
Interested in learning the lolcat language? Hey, these days, who isn't? This website is indeed THE definitive lolcats dictionary. Some other animals too are here, like the fabled walrus looking for his blue bucket.
So there you go, ten lolcat sites. A great resource for all you lolcat lovers. And you can even learn the speak the lolcat language. The Internet is indeed very wise.