What is a new phone with threaded text messaging?

I know of the iPhone and the Palm Treo. Also I know that you can buy and Windows Mobile based phone and download applications to have the threaded messaging feature, but it seems that each one of these applications have one setback. Are there any phones out there that when I take it out of the box it has threaded text messaging, besides the iPhone and the Palm Treo?

at t tilt

samsung instinct.