http://www.selfseo.com they've got some useful tools! Check them out, I don't own this site, just ran across it. I used their site speed tool, search engine index tools, all useful I think.
I think that site has a fake PR. I've check it using xenyo. Selfseo has a PR0. I got an idea that it has a fake PR because on it's page has a PR5 logo and a PR3 on my toolbar.
The site is PR 3 in my site toolbar Anyway, those are great stuffs! I love most of the tools aside from Keyword Suggestion Results. I don't think it shows accurate results.
Not a bad site although I wont go as far to say the tools are unique. However if my usual SEO tools site goes down then this would be a fine alternative.