Hummm, I'm a big fan of Chet Baker and Charles Mingus, they do mostly mellow/soft jazz - and as for swing revival, Big Bad Voodoo Daddy's music is really great too (it's LOUD)
Oh! And of course Cowboy Bebop is known for its jazz soundtrack, they do all kinds of jazz like bossa or bebop ^_^
I totally forgot about Amy Winehouse! I'm gonna have to listen to her music more!
Just in case though, here's my jazz playlist (that I've sent too many times!!)
to stay on topic, though, I recommend using spotify because I get wayyyy too distracted if I use Youtube or something like that.