The latest SQL2005 Express release occured this morning, and the Feb CTP release of SQL Server Express, Express Manager, and Dotnet Framework links are listed here.  These are the components that you will need to install in the order listed belowthat you need to install them:

1. Dotnet Framework 2.0.50110.27, download here:
   http://download.microsoft.com/download/e/a/7/ea749a11-f09f-4e9b-8d04-36763a71de58/dotnetfx.exe
   
   
2. SQL Server 2005 Express Feb CTP 9.00.1090, download here:
   http://download.microsoft.com/download/2/d/e/2ded4332-8fe1-4184-9709-badac71ccebf/SQLEXPR.EXE
   
   
3. SQL Server Express Manager Feb CTP 9.00.1090, download here:
   http://download.microsoft.com/download/e/9/1/e91e11e6-4929-4573-8862-7725a0dc496d/ExpressManager.msi
   
   
4. Visual Studio 2005 C# Express Feb CTP (optional):
   http://download.microsoft.com/download/a/5/e/a5efa6aa-b73c-4fa7-89b7-4a5fcd60f2a8/vcssetup.exe