After many months of work, IDA Pro 5.5 is now in alpha stage and this week the beta will be out for testing. In this version many small and big improvements took place, here is a partial change list:

PC module improvements
PE loader improvements
ARM processor module improvements
Improved Hex-View:

Edit support
Data display format: words, dwords, doubles, ...
Unicode or custom codepages

Bochsrc file loader: load a bochsrc file and start debugging the disk image
Windows Crash dump support: IDA now accepts MS Windows Crash dump files. Load the crash dump file and IDA Pro will create a database with the memory contents of the crash (if they were included). You can also run the Windbg debugger module and issue commands to the debugger engine to investigate more about the crashDocking interface: all windows are now dockable, allowing you to make optimal use of the desktop space.

This is for example how a desktop configuration could look like:

http://www.woodmann.com/ida_pro/pix/main55-thumb.gif ("http://www.woodmann.com/ida_pro/pix/main55.gif") And this is another desktop configuration for the debugger:

http://www.woodmann.com/ida_pro/pix/dbg55-thumb.gif ("http://www.woodmann.com/ida_pro/pix/dbg55.gif")

http://hexblog.com/2009/06/ida_pro_55_goes_alpha.html