ReverseDOS
Mike Campbell launched an interesting tool recently, and has been getting astonishing results with it.
I plan on investigating it when I get back in front of my desktop next week, just to see how it could be integrated into my CMS and start giving it some much deserved promotion.
Kudos Mike.
But before you move on, take another look at http://angrypets.com/tools/rdos/
This is a free product, with source. Not a commercial product.
"(No strings attached, no registration required, nothing, nada, zip, zilch, zero. )"
I haven't seen his code yet, but it's obvious that Mike has got a lot of marketing talent.