I've overhauled the build system and set up a server to make the builds repeatable. That means we now have a Windows version as well as Mac. Here's the zip:
http://hudson.joshy.org:9001/job/ArduinoX/lastSuccessfulBuild/artifact/dist/ArduinoX-win.zip
Just unzip it and run the EXE. It has Java and the compiler bundled with it. It runs on Windows 8. It should run on older versions of Windows down to XP, but I haven't actually tried them yet since I'm using Win8 for my job.
This build only has support for a few devices and examples, but it's easy to add more. Please try it out and tell me what bugs/features you want next.
Thanks.
Josh