I took the time today to install the June CTP of .NET 3.0 (see the checklist hereunder). It went rather well, and I didn't have major problems, but it takes a long time... well, when you do it on the balcony with your kids playing in the pool, it's not that terrible, is it? ;-)

Update: My WPF demo now works with the June CTP.

Uninstall May CTP edition:

1. Pre-released WinFX Runtime Components Uninstall Tool
2. Download and run Uninstall tool
3. Removed Debug tools for Windows
4. Removed Atlas
5. Removed FxCop
6. Removed Web Application project add-in
7. Removed Windows SDK
8. Removed WIC

.NET 3.0:

1. Install WinFX Runtime components June CTP
2. Install WinSDK June CTP
3. Install MSDN 2005 (from CD)
4. Install Orcas development tools June CTP
5. Reinstall WIC

Atlas:

1. Install Microsoft Visual Studio 2005 - Update to Support Web Application Projects
2. Install Visual Studio 2005 Web Application Projects
3. Download Atlas
4. Install AtlasSetup.msi
5. Install AtlasDocumentation.msi
6. Install AtlasSample.msi
7. Install AtlasToolkit