I've researched different project management systems over the last 8 years or so.

I've played with Microsoft Project quite a bit and have found it to quite useful in very linear projects but the tool can be quite complicated and sometimes managing the tool takes longer than managing the project.

The emergence of Web 2.0 applications and social networking was bound to spawn new tools.

Back in my WESTAF days, I used BaseCamp when working with Work Industries on search engine optimization. Really BaseCamp is a fancy to do list with some other features. One thing that I think is pretty slick about BaseCamp is the ability to integrate into BlinkSale, the invoicing system I use for my personal consulting. BaseCamp is good for small projects but doesn't really suit larger projects.