Web syncing

Hello, I’m relatively new to GTD. I got iGTD and am using it religiously (and have been for a few months) on my main computer (mac book pro). I just got an Asus eeePC to play around with, so no I want some way to sync my iGTD info with something on web that will allow me to look at it from home on my Asus. Better yet, if I could add things on that web app, and have it update the iGTD on my MBP when I get to the office, all the better. I guess .Mac does something like this, but I would rather not put out the money for that. Thoughts…? Thanks.