BufferZone sandboxing for Windows goes 64-bit, beta available for download
Unfortunately, BufferZone had one serious shortfall. When Windows 7 arrived and the push to 64-bit kicked into high gear, the program wasn't compatible. That has now changed, with the release of BufferZone Pro 4 beta which supports both Windows Vista and Windows 7 x64.
Interested testers can register for the beta, and it's worth trying out. Additional security -- especially at no charge -- is usually worth a trial run.