Sheet Music Website: Guitar Sheet Music Downloads

I am not sure, if I can ask the question here. If not, moderators, please move it to appropriate section.

I am looking out for a website that lets me download sheet music. I am in the process of learning guitar, and any resouces would help. I found some, but they required some special format readers, that I would be unable to have at internet centers where I browse the net. Hence, if there are any sites, that gives me the PDFs of the sheet music, that would be helpful.

Note: I am on the look out for sheet music and not guitar tabulatures. Tabulatures do not need any other readers, and can be shown in general ASCII supporting documents. But, it is the sheet music that gives the problems with the exotic looking symbols.

Sheet music. I think some program can show the content of a MIDI file as sheet. You can print it out also. All of Music composing software let you do that.

After all, the link:
http://musicmasterworks.com/