How do people get free links with blogs? Can you get them with posting comments on other peoples blogs?
depends on the platform with wordpress they would have had to installed a dofollow plugin or you could write an article for my blog
Most blogs where you can post comments have nofollow on those links so then they are useless if you are looking to improve your PR.
like stated earlier, they will probably be nofollow. but indirectly, comments can lead to links. commenting could be the first step to a relationship with a blogger. their exposure to your blog could then lead to future linking, blogrolling, etc. so just comment away and dont be afraid to contact other bloggers.