I went through the same withdrawl symptons when i had my Pocket PC !
I bought Strategic Assault but it was way too basic, Argentum showed promise but the developer seemed to disappear.
The greatest game i thought was Warfare Inc. I've never been a fan of the missions in the Red Alert games, the best for me were just plain skirmishes as each time the game was so different.
When the last version came out a year or two ago it offered you the chance to create maps using its own map editor you can download and to load up any skirmish maps you want.
Instantly that gave the game a ton of lasting appeal. Over at the website theres tons of maps to download, theres some very very good single player maps to use.
Its a pity there isnt a port of Command and Conquer but to me Warfare Inc is an excellent substitute.
. No mouse emulation yet of course but it works 