Free Online Learning Forum.

Some months ago, I stumbled into a wonderful website cum forum for IIT-JEE and other entrance exams. Getvidya is a unique web-portal that offers its users comprehensive guidance for cracking IIT-JEE. The site is founded and run by IITians and Ex-IITians who are very active in solving queries and doubts of students. Once you register there, you will even get to take online tests, download e-books [some e-books posted by me :)],Today Getvidya has about 2000 registered members and is still growing.
You can access their website here.