I'm so addicted to your service! So many people just don't understand that blog comments are STILL a very useful and effective linking strategy. You just have to do tons of inner linking URLs, tons of keyword diversity (go to Google Keyword tool and get a couple hundred related keywords to target keyword), throw in around 50 generic keywords, and top it off with yourdomain.com or
www.yourdomain.com about a hundred times. It is effective! I've been testing for about a month now. Of course, best to use on established domains and mixed with high PR blog posts, wikis, link pushes, doc sharing, not really finding press releases useful lately however, but use GSA to get TONS of platform diversity.
Once again, don't be afraid to push 1000 of these to your money site if you are careful. It works! Oh, and best to not use any indexing services at all. Let them get crawled naturally.
Of course, they are super effective for pushing web 2.0's but be sure to even give web 2.0's lots of diversity as well.
Hope your new captcha sites are coming through nicely! Any updates?