First, go visit The Infinite Cat Project.
Then, if you live in New York, get yourself to the Whitney Biennial, which is going on until May 30. As with most exhibitions of modern art, there was a lot of utter crap and a lot more that I was more than a little dubious about. But it's worth the admission fee for one piece alone: Yayoi Kusama's Fireflies on the Water, an installation which feels, quite literally, like being in heaven. I can't describe it adequately. Go and see it. You'll want to go in several times.
Ernesto Caivano's delicate, obsessive drawings; Glenn Kaino's giant zen garden; Amy Cutler's fable-like, disturbing gouaches; and Zak Smith's obsessively brilliant paintings of what happens on each page of Pynchon's Gravity's Rainbow - all 755 of them - are also more than worth the trip. Unlike the last Biennal and the Whitney's superbly disappointing "digital art" show, there's more than enough here to enjoy. So what are you waiting for?