Nokia announced the 5500 S60 phone a few weeks ago, I got a chance to test it at a recent conference.
Aftrer having made the switch to using 3G phones some six months ago, I never thought I'd say the following about a 2.5G phone:

I love it. Will get one as soon as it is out.

Ok, I am a sports and adrenalin junkie, so a nice looking phone with a sports profile is bound to be interesting.
But it's more than that. The 5500 has a very nice form factor, rests nicely in your hand, a good size for a smartphone, lot's of features.
No, it doesn't have 3G, a big display or WIFI like the N80, but it still rocks.

A peculiar fact is that the 3D motion sensor chip embedded in the phone mainly (only?) seem to be used for the excercise applications, like keeping track of how many steps you have taken so far during a day.
This sensor should also be very useful in certain games, assuming of course that there are appropriate APIs available for 3rd party developers.

We have done some experiments with motion controlled games here at Blaze, but it's not at all obvious how this technology is best used. Some games are perfect for motion control, while others simply make no sense what so ever.

For example, what about a fishing game, where your phone becomes a virtual fishing rod. You have to move your phone/fishing rod back and forth before releasing the line. NOTE: Should only be played with a wrist strap attached to the phone! :-)
Other game types that have proven to work well with motion control is certain racing games, whereas board games have generally proven hard to find good motion control for.


Some links to reviews etc:
http://www.forum.nokia.com/info/sw.nokia.com/id/ed555638-8299-4f9a-8b5e-a7973912308e/5500.html
http://digital-lifestyles.info/display_page.asp?section=platforms&id=3257
http://www.gsmarena.com/nokia_5500-review-83.php