Guitar Stuff
www.ultimate-guitar.com. You'll find tabs, chords, guitar pro tabs and everything else you think you need to learn guitar.

Geek Stuff
www.howstuffworks.com A cool website for all those who broke every toy in their childhood days in order to find how it worked. Here you can find details of everything that works- From computers to potato peelers, from space crafts to bicycles.
www.spats.in That's the website of IIT Kharagpur' Students Space Technology Society that I'm assosiated with. Right now it is doing some great stuff in its field. You can read an online version of a newsletter, The Moonwalk, that is publised twice in a semester by the society.
www.screentoaster.com A great website!! Using it you can record all the action that is going on your computer screen. A great tool for those making video tutorials for softwares.

Entertainment
www.youtube.com No need to say anything about it. Has a great collection of guitar lessons.It just rocks!!