Hi all, I don't play vanilla CoH very often these days, but I do play quite a bit of OMGmod.
What is OMG mod? In short, a persistency mod. No base building; you create a company using a large pool of resources, organise them into platoons, then do battle in large team games (2v2s - 4v4s). Units retain experience over time, and there's unique doctrines and new units, but vCoH stats are 99% unchanged so it's easy to pick up compared to many other mods.
We're having a 2v2 tournament next weekend, open to everyone willing to show up on the day. You can read all about it here:
http://www.omgmod.org/index.php?topic=12932.0
A couple of shoutcasts to get an idea of how it plays out (more can be found on the same channel):
https://www.youtube.com/watch?v=fxf3G4XGhvw
https://www.youtube.com/watch?v=rorWuOnpY_c
Feel free to leave any questions/queries in this thread and I'll get back to you asap