This short list should apply to a situation where an organization with one domain and a simple Exchange environment wants to upgrade from Exchange 2003 to 2007. It assumes everything will be installed on a single server with a fresh installation of Windows 2003 R2, joined as a member server into the domain.
I wanted to try out the Maemo SDK for Nokia 770, N800 and N810 devices (for some reason I happen to own one of every generation), but found out that there are no prebuilt packages for the 64-bit environment. The quick (?) remedy for this is the chroot jail, because a guest i386 environment can pretty easily be bootstrapped inside a 64-bit one. Here are the step-by-step instructions for doing it.