Would love to get my hands on this baby! Is it available anywhere yet ????
SharePoint Portal Server 2003 (SPS 2003), or Microsoft Office SharePoint Server 2007 (MOSS 2007)are not.
However, Widnows SharePoint Services (WSS 2.0 and WSS 3.0) that is what portal and server products are built on, just adding additional features, are. Free as in you need to have Windows Server 2003, so if you have that WSS is free.
Of course you can get a full evaluation version as well
SharePoint is the best product I have ever worked with.