I waited till the last minute to install C# Express, but I wanted to point out that the download page is potentially confusing. Yes, it says beta versions must be uninstalled, but immediately following it says that any previous versions of SQL Server 2005, VS2005 need to be uninstalled. The good news is that it will install without issue, but I wanted to post this as a recommendation to change the text.
Uninstall beta versions
Before installing, you must uninstall any previous versions of SQL Server 2005, Visual Studio 2005, and the .NET Framework 2.0 (this includes Tech Preview, Beta, or CTP versions).

Installing C# Express Edition After VS2003/VS2005
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lex23456
tyaramis
ShawnWilsnach
Rodrigo B. de Oliveira
Svitlana
mkb2006
Will I need to totally get rid of VS in order to use C# Express, or will my current install of C# be just as good, or what I guess I'm a little fuzzy about the differences between the "free" version (C# Express) and the one that comes with VS. Shouldn't the one you pay for have all the same features
Philippe Cand
Game Studio Express will only work as an extension to C# Express, however, you can reference the XNA Framework assemblies in VS2005 Pro for Windows development. You will have to use C# Express/GSE for 360 development. Please see Mitch Walker's post in:
http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=674288&SiteID=1
GethWho
nglow
Ix-Xerri
If it destroys my pro setup I will stay away from it...
Tammt
Annihil8
Freedon Nadd