My ShareWebDB_log file was huge on my SBS 2008 server.
So I fired up the SQL 2005 management express (run as admin)
Choose the ShareWebDB
Clicked on new query and did this:
USE ShareWebDb
GO
DBCC SHRINKFILE(ShareWebDb_log, 1)
BACKUP LOG ShareWebDb WITH TRUNCATE_ONLY
DBCC SHRINKFILE(ShareWebDb_log, 1)
GO
Now that file is much smaller