UPDATE:
Microsoft SQL Server Management Studio Express 2008
http://geekswithblogs.net/campuskoder/archive/2008/10/08/125727.aspx
I get alot of questions like this - who do I graphically design DB's with SQL Server 2005 Express Edition without installing a Visual Studio Express solution?
Here, download this - Microsoft SQL Server Management Studio Express:
http://www.microsoft.com/downloads/details.aspx?FamilyID=82afbd59-57a4-455e-a2d6-1d4c98d40f6e&DisplayLang=en