Hi!

I was wondering if there were a good recommendation for a multiplatform GTD application. I'd like to be able to have my system span both home and work, be mostly digital, and at the same time not be network-dependant.

My situation is thus:

My hardware at work is a Windows laptop. My home system is a MacBook. Bridging the two is an iPhone and a USB drive.

I am reluctant to use anything that is web-based, as some of the tasks are "sensitive work things" (client names, etc.), that compliance-type-folks would frown upon putting in the public internet.* On the other hand, I do want to be able to suck information in from other tools (Outlook, Mail.app, the web, etc.), so a completely analog solution isn't right on the other side.

I tried Thinking Rock, and will stick with that if it's my best play. However, I tried the OmniFocus beta, and fell in love. Is that going to be ported to Windows? Are there other good multi-platform options? Are there platform-specific tools that play well together?

*I will grant that there are risks with information once it leaves the office on that USB drive. However, there are steps that can be taken to mitigate it, it is not subject to any terms of service out of my control, and it lacks the prima facie ickiness ("you put our client info on google's servers?!?").