But if you are like me, not aiming on becoming a professional or skilled guitarist, but just love to play it sometime - even if it means hurting your neighbor's ears once a while, here are some site I found useful...
ClassTab
Over 980 guitar tabs primarily for classical music played on a standard nylon acoustic classical guitar. There are also supporting MIDI files to help you.
FreeTabs
Various genre of musics are available in TEF format. You need the free TEFView software to read and play these files. Best thing is you can read the notes, tabs and hear how the piece should be played.
Ultimate Guitar
Over 300,000 Guitar, Drum, Tabs, Chord and Notes available for free. There are guides, video lessons and forums. Musics are available in simple printable Tabs or Chords format and much fancy PowerTabs and GuitarPro formats. These formats needs it's own software to read and play the files.
Guitar Tablature Software
TefView
This software reads TEF format tabs files. It is light and free. But to create or edit the TEF files, you need the TabEdit software which in not free. If your aim is like me, just want to play, than just install reader called TabView. It plays beautifully.
PowerTab
This tab software is no longer been updated. But it is still available for download and it still works fine and it's free. There plenty of PowerTab file available at sites like Ultimate Guitar. Sound is not so natural compare to TefView and GuitarPro but many files are still available in PowerTab format only although a lot have been converted to GuitarPro format.
GuitarPro
This software I think is the most matured tablature software available for guitar. Plays the notes beautifully and naturally, if the tab creators put in the effort. It can also play PowerTab files and allow you to convert it to it's own format. This software is not free, but not so expensive too. A trial version is available for download.
TuxGuitar
This one I like very much. It can play all the above file formats and more. You can create your own tab files or edit others. And it is completely free. And it works on Windows and Linux OS. Take note, right now TuxGuitar still can not play GuitarPro's gpx files. But you can convert the gpx file to the older gp5, gp4 or gp3 format which TuxGuitar support, using this service at Tab-Exporter
While I hope guitar enthusiast find some of these information useful to them.
Thank you and happy playing :-)