- SerbianSchool.com - http://www.serbianschool.com/
A very good site for learning Serbian. It was even reviewed in Babel Babble № 5. Do I need to say more?

- The Krstarica Dictionary - http://www.krstarica.com/dictionary/
A serbian<>english and german<>english dictionary. I can't say I'm satisfied with it much, but it the best online.

- Bosnian, Croatian, Serbian (BCS) Reference Grammar
http://seelrc.org:8080/grammar/pdf/stand_alone_bcs.pdf
The best online grammar of serbian in english, I highly recomend it.

I have more, but these are the most essential ones, and they should be in the first post.

Keep them coming.
