Peruvian Nights and Jamaican Days

Does anyone know of any good radio stations or other music services online that don't require software installation (outside Media Player). I don't have install priveledges on my work machine, and the one I usually use, Yahoo! Launch has been extremely assy lately.

-Man, wait until PETA finds out about this!!!

-If I thought hard enough about it, I could probably come up with a really clever joke about this. Unfortunately, I'm just too damned lazy.

-m