My GF is a fairly light user. Firefox, some MS Office, iTunes for iPod management only, Mail...no Photoshop, gaming, etc. She currently has a 12" PB, which is still useable, but is showing its age. With Rev A MBAs getting cheaper by the day (especially after a live.com discount), I'm considering getting her one for Xmas. My concern is that she has a bad habit of leaving mutiple apps (Firefox, Word, Mail, iTunes, etc.) open all the time. I know there are heat/fan issues with the Rev A, but I'm hoping that even with those issues, she would still be getting a much snappier computer. Or...if she doesn't learn to start closing her apps, whether the Rev A will bog down to a performance level of that or below that of her current 12" Powerbook. Also concerned about the level of heat of the MBA vs the 12" PB, as she is also a diehard "lap" user. Any input mucho appreciated.