The Subtext blogging platform has just broken into the top 25 of all projects on SourceForge.net! As of yesterday, Subtext was 24 on the list of most active projects. Take a look at this link to see the current status.
To quote the site, "Project rankings are generated based on the traffic, communication, and development statistics which are collected for each project." There are well over 100,000 projects on SourceForge.Net, so to make it into the top 50, or even the top 100 is a nice accomplishment.