JamPlus

You need to provide a .config file with a Platforms section:

Config = {
    Platforms = { 'win32', 'xbox360', 'win64' },
    Configurations = { 'debug', 'release' },
}

Call jam --workspace -config yourconfigfilename.config.

Search the JamPlus directory structure for *.config to find additional examples.

-Josh

Brilliant, thanks.
I found it about 2 minutes before you posted, but I was having problems generating a 360 project until I realized that the XDK was installed BEFORE VS2010 (I only installed VS2010 recently, and have been stuck with VS2008 for my last project, so I haven't tried using it for 360 stuff yet).

Is it possible to restrict which build configurations are available to which platforms?

E.g.

Win32 - debug, release, ltcg
Win64 - debug, release, ltcg
Wii - debug, profile, release, debug-nand, release-nand

Unfortunately, there isn't a way to do this at this time, although that is just an implementation detail no one has ever asked for. Add it as a feature request.

I am not sure the Visual Studio solution format will support your needs, though. From the Jam side, it should be no problem.