I have just begun to explore some of the more recent Web 2.0 applications and their potential use for GTD. I have now set my system to use CalendarHub for my calendar needs and RememberTheMilk for my @NAs. There are some interesting integration points between the applications using iCal and RSS. Plus, I can access these lists from any aggregator using the feeds. The use of tags allows mapping of @NAs to Projects with ease. Good stuff.
I think this may be an interesting and flexible method of GTD.
Has anyone else tried these new web apps? Success or failure?
I'll post back in a few to share how things are going.