Firstly, I like your policy of free domains you sustain posting on these forums. Because people who are searching for free hosting will probably choose your site over some other hosting that has advertisements all over the place, and the ones looking for paid hosting will just go to your paid hosting. In that spirit, you could maybe try to add some feature so a user can check answers to their posts since last visit.
I understand there is a "View new posts" category, but it's not directly related to answers to user's topics/posts. And we can't really remember all topics where we posted all the time.
Also, maybe it would be useful to put the left sidebar at the bottom or accessible through a menu since I know it bothers me a bit that the forums aren't full-lenght throughout the site...
The last remark concerns your flash site, which doesn't really fit in the whole "knowledgesutra" picture. I think more people would be able to access your site if it were in HTML, and if the letters were a bit readable. Not all people can see that good and are that interested to research, some just want to see results right away...
And that's pretty much it, maybe you could categorise the topics in a little less subforums so more people would stumble upon content they're interested in...
Hope you implement my advices to the site!














