Fireball from a long time ago was moved on codeplex for getting a more great integration with visual studio and because i think for .net projects codeplex is the best choise, on the repository you find the latest version with an easy build system, you have to download the source with Team Explorer o by download snapshot there is no important improvement to source code we plan to recheck soon what need to be fixed and made the Final Release when this happen we plan to made a little documentations for building from source code.
We also added a new project called firefx3 here we plan to put the libraries for .net 3.0 and 3.5, now we only have a initial version for the Fireball.OpenXML the library designated for creating Office 2007 Documents using the
open specifications, when the library reach a first alpha i send a news here with some examples :)
The current build still be on
http://sourceforge.net/projects/dotnetfireball
The new location with future versions
http://www.codeplex.com/dotnetfireball