I have posted some comments on blog with mu url... Most of my comments are in PR 5 pages.... So can I get PR from that sute... my current PR id 0
Depends on the blog. Check if the links are not "nofollow". In that case you will not benefit. Also, depends on the blog owner. He might as well classify your comments as irrelevant and delete them anytime.
If you use the Firefox then download the Alexa Sparky plugin You can see all the nofollow link shows in Pink