So how helpful for your website SEO and PR would you say blog commenting is? Also, any links to high PR blogs that will allow comments with links would be much appreciated. Thanks.
Not really, to be honest. Too many people are chasing blog comments to make the PageRank and weight they pass worth it. (They're practically worthless.) You want to get a link from a blog - either start your own or ask the owner of another blog if they'd let you guest write for them.
Blog commenting is very important if you want to index your website in search engines such as Google. And also very important to rank your website in the SERP. You can get to top 10 for your keyword by just doing blog commenting (they must be of quality and the pages must have a PR). Regards
In my view point for blog comments you will not get that much value from the search engines. It may consider spam also. as it is very easy to get comments links. and this is not considered as one way link. you are commenting and getting the link. so if you do this in a huge way you me get penalty for this.
MJ, you won't get penalized for blog commenting. Except maybe by the blogger, but that's another matter entirely.
Only by commenting in do-follow blog you can have the backlinks for your site.if you can have the backlinks you can drive more traffic to your site and thus increases the pagerank for your site.