I will be posting test builds of the SVN code for Windows (Ansi and Unicode versions) from time to time. You will be able to find them at the test-builds directory of the FlameRobin website.
The first available version is built from SVN trunk, revision 1522.
Just unzip the proper version (vc/flamerobin.exe for Windows 95 and 98, vcu/flamerobin.exe for Windows 2000, XP and Vista) into your program directory. The builds are for testing new features and may have bugs, so if you depend on FlameRobin and want to make sure that you can go back to the last official version, just rename the original executable instead of overwriting it.