I had a similar situation a few months ago, coming from Unix at home to Windows at work. I started off with MonkeyGTD (a browser-based local javascript system), and was almost but not quite satisfied with that. I would still recommend it to anyone wanting a portable cross-platform system.

I ended up being able to install GNU Emacs on my work machine, and use the same system at work (org-mode) as I do at home. Emacs is also cross-platform, of course, but if you're not already an Emacs user, you probably won't want to start using it just for org-mode.

Since you say you liked your mac solution, get a mac notebook if you don't have one already. As long as you don't hook it to the corporate network, there shouldn't be any objections. The GTD apps that fit my needs best are on the Mac, and life is just too short for inferior tools.

iGTD is worth a look if you haven't done so already. However, I've given up on web apps for two reasons. Other than iGTD, none of the solutions are close to being as good as what I already have on the Mac (I use kGTD and Devon Think), and I don't trust that the developer will be there a year from now . . . never mind 10 years form now (this certainly applies to iGTD).

I have made numerous compromises - including not being able to take everything with me wherever I go. I accept that many projects will live in Microsoft Project, and I accept that some common work flows will never make it to my Mac (stuff from our HelpDesk and procurement systems). Of course, these inputs would be just as untouchable to a web app as well; and, to a certain extent, would even be outside a PC-based GTD solution.

A consequence of my approach is that there is a great deal more cutting & pasting than would be the case if I would have accepted a GTDed Outlook solution. Again, I think it is worth the extra effort though I'm sure some would disagree.

Jason,
Thanks for the reply, I have tried MonkeyGTD and other wiki-on-a-stick solutions before and have always managed to screw them up some how (i.e. nasty error messages trying to save it, or it not getting saved at all). But that was when TiddlyWiki was very new, so I'll take a look again.

Yucca,
I think you may have hit the nail on the head trifold. 1st, I worry about putting all my data in a system that can't really be trusted like a webapp provider who is here to day but disappears tomorrow. 2nd, windows GTD apps feel very kludgy (at least the ones I've tested) and you are completely right about wasting time with inferior tools, and 3rd, I do have a Mac, and I can put up with cutting, pasting and emailing (for now).

Thank you both for reply, I know the Windows portion of this board gets less traffic, so I appreciate your time.

I don't read the board by sections; I just use the New Posts link above to see everything that's new since my last visit. Usually I don't realize what section a thread is in.

There's Tracks.

I'll second the recommendation for Tracks. The feeds that Tracks publishes (plain text, iCalendar, rss) make it a flexible and utterly hackable solution. You host it yourself, and you could subscribe to your calendars in Google Calendar or use a feedreader like NewsGator or Google Reader. Tracks is nice in its Ajaxy RoR goodness. Best of luck!

There's also Thinking Rock, I tried it and wasn't crazy about it. It's written in Java (what is it about Java apps that they generally are kind of sucky?). It is cross-platform: Linux, Mac & Windows. You might give it a go.