Sanskrit is the mother of Indian languages and the language of Indian scriptures. Sanskrit is very well structured and refined. In fact, samskrutha itself means refined.
Here is a good repository of sanskrit documents for the enthusiast and the interested -> http://sanskritdocuments.org/
If you are interested in learning to speak Sanskrit or know further, you could see the Samskrita Bharati website. Samskrita Bharati conducts spoken Sanskrit and grammar classes in Bangalore and several other places in the USA.
Chinmaya International Foundation also conducts online sanskrit courses. See here.
World's first ever Sanskrit Book Fair will be held in Bangalore from Jan 7-10, 2011 More details here.