I finally gave up my aging Nokia E61i and got myself an Apple iPhone 4S.
Loving it. Siri is fun, but not awesome, although I have used it a couple of times to send a text (or iMessage) while walking, which is really useful.
The benefits of a 4S are all well known so I don't need to go into much detail, suffice to say that as my first phone device to do 3G data properly without worrying about cost too much, it's awesome. I never really used the Nokia 3G data as the cost didn't justify the value, but with the iPhone, it certainly does now.