For those hardy souls who want to try every single Getting Things Done application available for Mac, the alpha version of iGTD 2 is now available for download. Please note that the iGTD 2 alpha is Leopard only. Additionally, as alpha software, it is likely not feature complete and is probably rife with bugs (already there’s been reports of problems with changing the sort order in the task tab). This is an excellent chance to try out all the alternatives before OmniFocus’s half-price sale ends, but I doubt you’ll want to use iGTD 2 for actual work yet.
Personally, I’m really excited to be able to try iGTD 2 out next to Things to see how two different developers implemented a similar idea. I had mixed feelings about iGTD 1, but given how much I’m enjoying Things, I suspect that iGTD 2′s interface changes and general approach to tasks will make it a much more compelling task management app.