Subsequent to the legal action filed against OLGA (the OnLine Guitar Archive), I've archived some of the Sarah guitar tabs that they used to have on their site. I'm not a guitarist, so I asked a guitarist what the different types of files signify (i.e. what's a .crd versus what's a .tab). A .crd file normally lists lyrics with the chords over the approximate lyric (word) that accompanies each chord change -- they contain the basic rhythm of the song. A .tab file is normally more precise, in that it is guitar notation that lists the notes played by representing the six strings with lines, a number on the line indicating what fret at which that string is played. Normally more precise than .crd files.
Thanks to John Dorsey for
providing that information.
Update (04/30/2001): OLGA is back in operation (somewhat) and you can try a search for Sarah tabs although their selection isn't as vast as it used to be. guitartabs.cc also has quite an extensive collection of Sarah tabs, some of which I don't have here.