I was unimpressed by the fact that you have to run the maps from cd. Its slow and you have to drag out the cd's with you. Here is a solution:
Copy your cd's to your hardrive (I only copied the East CD and I put it in the C:\Garmin directory)
Run regedit and navigate to
HKEY_LOCAL_MACHINE\Software\Garmin\MapSource\Products
Under that I have 4 entries, labeled 6 through 9. These correspond to
Alaska, Hawaii, West and East US. Each one of them contains 3 keys. Bmap and Tdb will already be on your machine, Loc will point at a subdir of your CD-ROM. Just change that subdir to point at the location of the appropriate subdir of the cd you copied. (In my case the key value would be C:\Garmin\East)