I also got my mrs a Samsung Galaxy S. All and all, I am impressed. The phone is lightning fast, screen is great, there are tonnes of apps, battery life is good, it will get flash shortly but...

And here comes the big but. As OP has pointed out, after using the N900, lack of proper multitasking is utterly frustrating. Also, not being easily able to do simple stuff like mounting the phone as a folder using sftp (one click on Ubuntu); lack of camera flash, making is a nightmare to take decent pics at night; no FM transmitter making it useless for me in the car; a navigation software which takes longer to lock the GPS (even after the so called GPS fix) than N900, and most of all a lack of real keyboard meant that I kept coming back to my N900. It is only when you don't have the stuff that you take for granted that you realise how much you miss it. That was exactly the case with me. Lately, I have also added another thing to this list... lack of fcamera and hdr picture capability. I absolutely love it....