I had pre-ordered my copy of Windows 7 Home Premium 64 bit and I must say I am impressed! 
I backed up my documents and other stuff and did a fresh install and WOW!
On the RC 7100 in the windows experience index was higher on a few items than in Vista.
But on the actual Windows 7 Home Premium 64 bit version the ratings were even better:
Processor:========> 7.3
Memory (RAM):====> 7.4
Graphics:=========> 6.8
Gaming Graphics:===> 6.8
Primary hard disk:===> 5.9 (this was the only one that was not better!)
On Vista all were 5.9 and on the RC only the top 2 were 7.3 with the rest 5.9
Woot!
I backed up my documents and other stuff and did a fresh install and WOW!
On the RC 7100 in the windows experience index was higher on a few items than in Vista.
But on the actual Windows 7 Home Premium 64 bit version the ratings were even better:
Processor:========> 7.3
Memory (RAM):====> 7.4
Graphics:=========> 6.8
Gaming Graphics:===> 6.8
Primary hard disk:===> 5.9 (this was the only one that was not better!)
On Vista all were 5.9 and on the RC only the top 2 were 7.3 with the rest 5.9
Woot!

My Computer
- OS
- Windows 7 Home Premium x64, Ubuntu 10.04 x64
- CPU
- Intel Core 2 Quad Q9550(2.83GHz)
- Motherboard
- MSI G31M3-L V2
- Memory
- 4MB Kingston DDR2
- Graphics Card(s)
- NVIDIA GeForce 9800 GT 512MB PCI Express
- Sound Card
- Sound card - Integrated
- Monitor(s) Displays
- Hanns·G HG-281DPB Black 28" 3ms 1080P LCD HDMI Monitor
- Screen Resolution
- 1920 X 1200
- Hard Drives
- 1) 500GB SATA-II 7200RPM
2) Fantom GreenDrive 1TB External HD - eSATA, USB 2.0
- Cooling
- Masscool 8W553 CPU Cooling Fan
- Other Info
- 7 fans - 2400-2800 RPM cooling fans: (5 case fans, CPU and GPU)