We've just released a new white paper that discribes Management Studio Express and gives some of the basics of database administration. You can download the paper from http://download.microsoft.com/download/4/f/8/4f8f2dc9-a9a7-4b68-98cb-163482c95e0b/MgSQLExpwSSMSE.doc. This paper will be available on MSDN soon.
If you didn't know, Management Studio Express is a scaled back version of Management Studio that is currently available in CTP. Once release, SSMSE will be the free, GUI management tool for SQL Express. You can download the CTP from http://www.microsoft.com/sql/ctp_sp1.mspx.
Mike WachalSQL Express team