Well it's bound to happen sooner or later, SonyEricsson released the z600, a replacement for the T610. It's clamshell, and a bit thicker than the T610, but it has a better screen that means the screen in the sunlight will be easier to read. Perhaps an eBay purchase of the screen will change that disadvantage.

Thanksfully someone sent me the new themes for the phone, so I can pretend to still have the latest.