Sony Ericsson P910i now, before that a P900, and before that a P800..
I'm tempted by the P990, but the whole P series has had one annoying problem (for me on O2 in the UK), and that's that SMS text delivery is somewhat.. random, to say the least.
It's like the phone sometimes 'forgets' it's meant to tell the cell tower that it's alive sometimes, and so it falls off the network until the next time you make a call/make it roam between cells.
Very, very annoying - I've had two SIM cards on two different contracts (so I doubt it's an account or SIM problem), and if I use an ollld Nokia with the same SIM it's flawless.
So I'm wary of shelling out a ton of cash on the P990 and it having the same fault, so I'm tempted to go back to Nokia, maybe.. maybe..
Gah - I only really need a phone that makes calls and texts now, the P series were nice when I needed a mobile office, but I don't anymore..
Although being able to SSH into my *nix boxes on my phone was neat for geek-factor points