I've got a 2006 pre-unibody MacBook Pro with a 2.33gHZ Core 2 Duo CPU, 4GB RAM and a 7200RPM hard drive. I'm very drawn to the brand-new MacBook Air models, but I'm concerned about performance. Lately, I've been using my MBP to write (MS Word, OmniOutliner), do some basic data analysis in Stata and Excel, basic photo cataloging and editing (mostly in iPhoto) and web browsing. When I bought this MBP, I was using virtualization to run Windows and doing a lot of data analysis (ArcGIS, Access, SPSS, etc), so I needed the fastest mobile hardware Apple sold. But now I've got a workstation-class Windows PC for the Windows stuff. Raw computing power isn't at the top of my priority list anymore, but I certainly don't want my new computer to be slower than my old computer. Can anyone who has used the new MBA help shed some light on the real-world performance?