Liz Climo consistently makes some of the best comics on the internet. You should check her out if you like cute animals and things that are funny.
One of my favorite webcomics, Mr. Lovenstein, just joined Tumblr and I highly recommend that you follow him.(btw, there is usually a bonus rollover panel on the Mr. Lovenstein website.)
Sunshine is the best kitty tamerPre-order the new Cat Versus Human book