I'm now using Windows 7 Beta (Build 7000) as my day-to-day operating system.
It is generally very well behaved I have to say and appears to be what Vista should have been from the start. Vista reminds me a lot of Windows/ME, anyone remember that? Another failed Windows build. In reality, Vista was the Windows 7 beta.
Of course, there are a few rough edges and I'll do a post about them shortly.
The PC is a Dell M1710, 17" screen and 4GB RAM with WiFi and an NVidia 7900 series mobile graphics card.