Thanks for the mention! (I'm the founder of Blogalia :)
IMHO, greaterskies.com is interesting as a project, but:
- I don't think anyone will pay for simple visual star charts: there are free sites, free desktop programs and free tablet/mobile apps out there.
- If not for visual, but deep sky: there is 3Atlas from José R. Torres (9, 11 and 13 mag sky atlas): http://www.uv.es/jrtorres/tools.html Available for free in PDF.
The first battle SourceForge lost was against Google Code hosting. Google offered a nicer interface and had some features SourceForge hasn't, the most important one, subversion.
SourceForge, like other sites managed by VA Linux/SF/Geeknet, has a terrible record of user friendliness. How many Slashcode-based sites are still running?
Just going by titles it sounds like the NYTimes related article popup at the bottom of an article would be covered by these even more than some of the alleged companies.