When poor in knowledge

yadā kiñcij-jño 'haṃ dvipa iva madāndhaḥ samabhavaṃ
tadā sarvajño 'smīty abhavad avaliptaṃ mama manaḥ
yadā kiñcit kiñcid budhajana-sakāśād avagataṃ
tadā mūrkho 'smīti jvara iva mado me vyapagataḥ || BharSt_1.8 ||

Bhatṛhari, Nītiśataka 8 

learnsanskrit.org

learnsanskrit.org is a new website dedicated to spreading the knowledge of Sanskrit over the internet. It has a fresh look and a great layout. The main feature is the grammar that is conceived in tutorial style with exercises at the end of each lesson.

In their own words:

learnsanskrit.org aims to explore how the unique qualities of the Internet can facilitate the task of learning and teaching Sanskrit. To some extent this site is iconoclastic, for although it owes much to both traditional Sanskrit grammar and classical Western philology, it does away with both whenever they make the task of learning Sanskrit needlessly complicated.

Lots of thanks goes to....

... these guys who, by their effort, made the bellow blogs available.

http://sanskritebooks.wordpress.com/
http://bharateeya.wordpress.com/
http://hinduebooks.blogspot.com/

On these blogs one can find tons of sanskrit e-books.