I recently bought a Madcatz SF4 TE fightstick. (Haven't opened the package yet, though, as we're having visitors staying at our place for a few days.) The package of the stick is already a piece of art itself. The stick is supposed to be pretty much the best one can get (Sanwa Denshi stick and buttons), so I'm eager to try it with SF4 and HDR.
I've been reading a lot on the Shoryuken forums lately, it's a great place for all kinds of Street Fighter related information.
Here's an info page I found about switching from playing with a pad to a stick.
This coming week-end, the yearly Evo tournament will take place in Las Vegas. Here's a nice article about it, telling a bit about its history.
Also, here's a play-in-your-browser-version of Street Fighter 2 CE.
Update: Daigo won the SF4 tournament, as many expected. Pics & article, more.
Update 2: Nice panorama picture of the Evo-room, Flickr photostream of Evo Championship Series and Vids, Kicks and Pix from the Capcom Unity Blog.