Unless this is the first time you've looked at your computer all day, and the SQL Express blog is the first page you've looked at, you're probably aware that SQL Server 2005 officially launched today. Just check out Microsoft's Homepage and the SQL Server Homepage if this is news to you. As part of this launch, SQL Server 2005 Express Edition is now generally available to the public; here are some direct links to help you explore the Express Edtions:
Also launched today is Visual Studio 2005. SQL Server and Visual Studio are integrated as never before and that integration goes all the way through to the Express Editions. You can check out the Visual Studio 2005 Express Editions if you are interested in developing data based applications with a free database and a free development tool.