Thanks Peter, the blog is very very useful.. I have a few questions if possible.
In your blog you discuss UsrClass.* not being roamed by default, however the behaviour can be changed with policy changes to View Persona. Do you know if these files can be roamed with standard Microsoft roaming profiles with modification to some policy?
Also, apart from the issues you mention at the beginning of this post (my question) have you came across any issues with packages which experience problems when the sandbox is located on a network share?
Lastly, if I stream from the network, register with thinreg and locate the sandbox on the network I should also be roaming the UsrClass files when using no persistent floating desktops?