Want to try Sony Ericsson Xperia Arc? Well, you can try it now on HTC HD2 with Xperia Arc ROM. Basically, it is a combination of Nexus One and Xperia Arc ROM. It is based on Android 2.3.5 and using Tytung r11 Kernel.
Xperia Arc ROM for HTC HD2 is still in beta stage. Do get the latest version from XDA.
Installation guide ~ How to Install CWM NAND Android on HTC HD2? (Video)
Download Xperia Arc [Kernel: Tytung r11] NAND Zip ROM build 24 here.