The process of commenting (leaving your views) on someone elseís blog is termed as blog commenting. Itís an excellent SEO technique if done properly i.e. commenting intelligently (adding value) on niche related blogs.
While commenting on a no-follow blog might get you streams of referral traffic, commenting on a do-follow blog brings you backlinking credit.
Blog commenting tips:
-Always comment on niche related blogs
-If at all possible, use your real identity and photo
-Read previously posted comments on the thread
-Make your profile link point to an appropriate place
The technique works great with me, I use Keyword Country to find traffic-pulling, high authority, related blogs to comment on...I am all for it!