I'm so hooked on Instagram. (http://instagr.am). I'm sure you've heard of it. It's a cool way to share images: shoot something; crop it to square format (pretend it's 120 film), add a retro/hipster/lo-fi filter, and upload it for everyone to love and comment on it.
It's iPhone only at the moment, but you can view Instagram streams in a couple of cool ways:
Check out my Instagram pics and let me know what you like.