It appears that recent changes to Sourceforge’s download services to make you pick a mirror before downloading are causing problems with some download managers.
If you use a download manager, please bypass it or turn off the browser integration when trying to download the snapshots from the downloads page. Sourceforge administrators have been made aware of this issue.
As well as working on particle systems right now, I’m also testing out Visual C++ 7 (VC.NET) with the intention of enabling OGRE to be built on both VC6 and VC7 by the next snapshot, for those of you who have upgraded.