I just bought the SE K750i last week and I must say: It is the smartest phone I have ever seen. Practically a mini PC, but the size of a small candy bar.
It has a 2 mP camera with flash and when I send it to my PC it rivals many point and shoot cameras. Other features: BT, speakerphone, voice dialing, ., video camera, mp3 player, etc and the freaking thing is SO small. Perhaps, the coolest feature, it syncs with my PowerMac G5 and PB G4 seemlessly with no software add-ons. I had all my calendar info, and contact lists synced up with the phone in less than one minute. Even cooler feature, it can serve as a remote control to my computer through BT...awesome for giving Keynote/powerpoint presentation. Still not impressed: How about being able to call someone/SMS them from your computer through the phone. I really believe sony ericsson is BACK with the best phone on the market since the T68i five years ago.