Maybe you could use an index file or something, in a fixed location, where we can say:
[stable]
v2.5
www.ml.fm/ml25.zip
[ports in progress]
1100D/T3
www.ml.fm/ml-1100D.zip
5D classic
www.ml.fm/ml-5Dc.beta4.zip
etc, you get the idea. You can also get some feeds for nightly builds.