OmniFocus and Spootnik
I agree with Eddie's recent post about using a Windows machine as just another tool or context. However, as a registered Spootnik user, I can tell you that web access to my tasks in OmniFocus is very convenient. And to Eddie's point that installing OmniFocus on every computer I work on would be a drag, Spootnik means that I don't have to. Web access means that I can use OF on any device I feel is appropriate at the time.