ditto above, they're nearly all wrong! I just use em when I'm being lazy to get the key or a basic idea then work out the rest for myself.
I use
911Tabs - tabs search engine // 3,500,000 tabs. Guitar, bass, drums, guitar pro and power tabs! - you type in the artist or the song and it comes up with all the different tab sites that have it. Saves a lot of searching different sites and coming up with rubbish.