I quite enjoy a game of Memoir '44 online. It's no substitute for a proper wargame with toy soldiers and such, but it is always there and that's no bad thing.
One thing that I hadn't noticed though was that the scenario editor allows you to make your own maps, and upload them to the website. Not everything in the editor can be added, the online game, which seems a bit orphaned to be honest, hasn't implemented a lot of the new whizz bangs like mortars, machine guns and other good stuff.
Now I've had some success using Memoir '44 Online as a mechanical turk, setting up the game with my figures and then using the AI to provide an opponent. Of course, I'm limited by the scenarios that come with the game.
However, I have discovered the Scenario Editor not only allows you to make your own maps, but also allows you to play those maps both online and using the games AI. Now as I said, the online game lacks a lot of the features of the board game, but even with that limited ability there are some intriguing possibilities for solo play.