Where do you find the best FREE backingtracks, is there a website dedicated to this?
Is there a forum/thread here that is dedicated to this
http://www.guitarbackingtrack.com/ is the one I used, I've stopped playing with backing tracks. You can also search Youtube, some pretty good ones are there, as well as general "blues in X" or "ballad in Y" styles

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Blues player of the Laney Cult
i downloaded steve vai's naked tracks for free (i think i found a torrent on demonoid.com). its most of his songs without the lead guitar, great for improvising.

as for specific songs that you want to practice playing guitarbackingtrack.com is the best ive seen