For a couple of weeks Sharepoint Foundation, the successor of WSS 3.0 and the “free” version of Sharepoint, has been available for download.
You can download the final version here and try it out for yourself: http://www.microsoft.com/downloads/details.aspx?FamilyID=49c79a8a-4612-4e7d-a0b4-3bb429b46595&displaylang=en