Nuevotec is one of the most popular site’s for videos and photos of Salsa events like regional congresses and international championships. Their videos are very high quality; these guys are professionals!
An excellent resource for learning more about salsa instruments and rhythm patterns. The site navigation can be pretty bad at times, and I don’t recommend learning salsa from the videos section, but the site offers some of the most detailed explanations of salsa rhythm patterns anywhere on the net (check out the timbales section below):
Located in Central Square in Cambridge MA, Teddy Shoes sells shoes for dancers, including salsa dancers! I personally wear a pair of women’s size 8 Bloch jazz shoes, and I got them at a good price there! And NO, I’m not getting any commission for recommending them ;)
By the way, if you’re going to buy jazz shoes for salsa dancing, I highly recommend that you get them a little smaller/tighter than what you’re usually used to wearing for street shoes, because they’re made from leather, so they’ll stretch out (sometimes quite a bit) after you wear them for a few times.