We don't use sourceforge much anymore - see the following links for more info:
User information, tutorials, data, downloads:
http://www.na-mic.org/Wiki/index.php/Slicer:Slicer2.6_Getting_Started
Developer info, building:
http://www.na-mic.org/Wiki/index.php/Slicer:Slicer_2.6_Building
General overview information:
http://www.slicer.org
Information on the upcoming new version:
http://wiki.na-mic.org/Wiki/index.php/Slicer3