Ultimate Guitar

Ultimate Guitar

Ultimate Guitar contains a lot of useful resources in addition to guitar tablatures - including guitar lessons, reviews, forums and contests.  The tablatures are well formatted and it’s a pretty easy site to use.

Chordie.com

This is one of the better tab/chord search sites on the internet. The search results are nicely displayed and well formatted.
Chordie.com also has a useful key transposer and chord charts that comes in handy. The chords are often done in bold blue text making them easy to view.

Guitaretab.com

Guitaretab
Guitaretab is a guitar tablature site with a limited number of tablatures but the layout of the site is pretty good and it’s easy to navigate around.