I noticed that it doesn't appear as a specific item supported by iSync, but it is a siemens bluetooth phone and they are listed as being supported. anyway, i've decided that I will either get that or t637. i've seen plenty of people say great things about the se, but only two mentions about the s66 on this site. I would like to get the phone that is better for two things - communicating with my computer and making phone calls (and not in that order). I'd like to get good battery life. The only other thing that I might care about would be the ability to play mp3's which I think neither does. Does anybody have experience with both phones, or at least enough with the s66 to make some comments? By the way, they are the same price now with Cingular, so that is not a factor.