Using these methods is fine but always look out for the NOFOLLOW tag now used in most blogs / sites comment systems. commenting to URL with the rel=nofollow tag can cause damage to your link building strategy. sites like longwarjournal.org (one of the PR6 sites mentiond before) is using NOFOLLOW tag so commenting there is useless. always view the source of a site and search for this tag before making any time consuming efforts. Regards to everyone
Good point but for the newbies that are worried their site will be damaged by commenting, I think this would be better stated as "Commenting to URL with rel=nofollow tag is a waste of your time". It won't hurt you, it just won't give you any benefit and your efforts are better spent elsewhere.
Yes i have tried several of the forementioned pr6 7 8 site... i tried 3 site and all three are no follow... I don't know about it can damage rank or not but it certainly put my rank down up to 10 result after it indexed.
I think all SEO minded people or bloggers than wants to improve their link building, need to know this.