Hi Nahil, welcome. :-) Answers inline below.

On Sat, Oct 10, 2009 at 4:42 PM, Nahil Jain <nahiljain@gmail.com> wrote:
Hi all,

I am a newbie in wikimania community. I would like to contribute in whatever way I can to community and its projects.

I want to know where can i find papers presented in previous years wikimania.

2005: http://meta.wikimedia.org/wiki/Wikimania05/Index
2006: http://wikimania2006.wikimedia.org/wiki/Proceedings:Index
2007: http://wikimania2007.wikimedia.org/wiki/Proceedings:Index
2008: http://www.kaltura.com/devwiki/index.php/Wikimania_Sessions (Kaltura? Are these not archived somewhere on Wikimedia servers?)
And Mariano gave the link for 2009 ;-)

 
I would also like to know about various projects in which I can contribute .

Have you seen the research-l mailing list <https://lists.wikimedia.org/mailman/listinfo/wiki-research-l>, or other research-related pages on Meta<http://meta.wikimedia.org/wiki/Research>? (The latter link is not so up to date - could do with revamping.)

Cormac