There are many dozens, and there's no quality control, so a site that looks "good" for some tunes is no good for others. I have book marked a load of sites that I thought would be useful in the future, yet each time I need a certain part of a song I find the most reliable way to get it is to do an advanced search using only song- and band-specific key words.
Then there are sites full of listings of other sites, and sites of sites of sites....the layering is ridiculous, and many of the them link to the same source files. A search each time is the best bet. But to answer your question, here are a few tab sites that I've used.
thanks a lot for your help, guys! I checked most of them out, they seem to be very useful. boy, I see myself getting to bed quite late today
all the best, smirky