Hot Hardware have an interesting article on the performance of SSD drives in Windows 7, including plenty of benchmarks:
Read more here.Our performance numbers verify our initial impressions of Windows 7. Platter based hard drives and high-end solid state drives, all run faster on Windows 7. Solid state drives see the largest performance boost, which showed up to a 35% improvement in read performance and up to a 23% boost in write performance. The performance difference for platter based hard drives is admittedly smaller, but even though the numbers don't showcase it, there is a definitely smoother, snappier feeling to running Windows 7 compared to Vista, which can be perceived even on traditional hard drives.
Windows 7 does a lot to un-do the damage that Microsoft did with Windows Vista. Windows 7 feels lightweight, fresh, and far more intuitive. Sure, lots of the new user interface elements are pulled from the Mac OSX design guidebook, but they are implemented well in the Windows environment, and the whole thing feels polished. Even in a release candidate (i.e, non-final) state, the OS is quick, solid, and feels production ready. For the first time in years, we are anxiously awaiting an operating system release from Microsoft.