Windows Mobile team at Microsoft is clearly at work these as we get to see new improvements every week. The latest Build 23022 of Windows Mobile 6.5 is out. It has got all the features ported from Build 219xx plus some more new features and improvements. The whole UI looks much more cleaner now and is much more speedy plus memory management in this new Build is said to be excellent.
Folks at XDA-Developers have released two test builds of Windows Mobile 6.5 Standard & Premium (Build 23022), both with and without HTC Manila 2.5 (aka TouchFlo 3D) interface.