It is my understanding that any updates that came out in July 2009 or later, don't require cd's in the drive.
That would make the following NAP games that can run with no cd to be:
Ecknuhl (updated 02/22/10) and Austerlitz (updated 12/14/09)
I know that they are in the process of creating updates for the other NAP games however, I do not know which titles will be updated next, or exactly when they will be released.
In case you are not aware of it, you did pick a very good title by getting HPS Waterloo.
Don't forget to download the free HPS Waterloo expansion pack which contains 83 scenarios, 4 new maps, and modified OOB's which allow players to use company-level units instead of the default battalion/regiment.
http://www.hpssims.com/Pages/FreeFiles/L...20Waterloo
There are also some really nice 3rd party art mods available for Waterloo:
By Blitz member Atle:
https://www.theblitz.club/message_boards...?tid=60132
By Blitz member Volcano Man (over at his web site) which include a sound mod and and unit art mod:
http://www.volcanomods.com/index.php
And by Ezjax2 (Don't forget to get the 2D and also the 3D downloads which are separate zip files):
http://ezjax2.com/HPSMod/index.html