I tried FusionDesk a couple months ago when I was looking for a good GTD app. It was really cool, but I could not afford the $100 pricetag, and so after that 14-day trial, I uninstalled it, and kept looking.
Today only, you can download the Deluxe version of FusionDesk for free, as long as you install it tonight. The catch though, is that you cannot re-install it if your hard drive crashes, or you re-format your computer. Anyways, go over and check it out, its worth a download.
FusionDesk Deluxe [Giveaway of the Day]