Well I found good article to increase site traffic. Here is their 6 points.

1. Optimize Your Website
2. Linking Your website
3. Post Articles
4. Anchor Text
5. Tools
6. Target Niche Keywords


Read:
http://www.dagsensecodes.com/2006/11/6-tips-to-drive-traffic-to-your-site.html

I think this is very informative posts and article is best for me and very easy to use this tips. I think this is a simplest way to get traffic. I will try to use all points because my blogs are 3 months old and have no traffic yet. Only getting 10 to 15 hits on the day. Thanks for it.

Well it is a very low traffic for any site or blog. I suggest you to use Social Bookmarking website to get some good traffic. You can find some free service of Stumbles which offers 50 stumbles and reviews. Best of luck for it.