ok can someone please list all the PR7-PR5 blog and article sites that let you have your link to your business in your signature? Because i know some don't let you have your business link in your blog or article. Thank ))
There are millions, impossible to list. You should rather look for related blogs and post comments there.
What I normally do is head for a directory (DMOZ is a good place to begin), look for sites in the same subject area as mine and check their PageRank one by one (slow but does the job). I then see which of the high PR sites (PR6+) allow you to leave a signature and get to work.