Shiju,

Thanks for very helpful pointers. Using mailing list to build a community is a good idea. 

We have a Tamil Wiktionary Google group with 192 members at 

http://groups.google.com/group/tamil_wiktionary

This has been operational since 2006 and helps people who are not comfortable with wiki format. 

Though, we don't use it for project related discussions, the main objective of the group is to engage people in Tamil word related discussions and transfer consensus words to Tamil Wiktionary. We need to coin new words in so many fields. 

We also have many people interested in tracking Tamil Wiki progress and using the meta mailing list will be good to stay in touch with them. 

Ravi