Do you know of a good GTD software for Windows ?

Having switched back from OS X to Windows 7, the only application I am missing, out of iLife’09, is my OmniFocus GTD manager. I have been looking for a good GTD application during the last days, either as a web app or as a standalone windows program, and I am pretty disappointed by the results.

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Seems like there is no decent GTD software for Windows (clumsy interfaces, lack of features, no iphone sync, …) compared to the OS X platform where numerous software help you using your preferred productivity method.

At this time, I am beginning managing stuff with Tudumo and I will see how it scales up during the next days, but I am missing OmniFocus .