SalsaPower: Site mainly (but not exclusively) devoted to Salsa de Casino (Cuban style). Many interesting pages of information about salsa events and congresses all over the world!
USA
Learn Salsa: The popularity of LearnSalsa.com is out of control and becoming nation-wide! LearnSalsa.com and it's affiliates are heavily involved in the Entertainment Industry and in the Los Angeles Salsa Scene
International salsa scene 
World Wide Information
USA 