Just a quick note. Watch out for where you install the new Blender 2.56beta, it looks like the default installation path, for Windows OS at least, has been changed from;
"C:\Program Files\Blender Foundation\Blender"
I don't remember previous versions using that default install path? Not a big fan of installing apps into that location myself so keep an eye out for that one. It's also not installing the desktop icon as usual so make sure you remember where you installed so you can make one where necessary.
IMPORTANT: both the ASE and MD5 export scripts are broken in 2.56
Traceback (most recent call last):
File "C:\Users\[user]\AppData\Roaming\Blender Foundation\Blender\2.56\scripts\io\export_ase.py", line 494, in invoke
AttributeError: 'WindowManager' object has no attribute 'add_fileselect'