Having some fun atm. Since the demise of CoH was announced, a team at the Titan network has been trying to write a replacement MMO with new IP while keeping the spirit of CoH.
A couple of weeks ago, Golden Girl decided she couldn't live with some of the design decisions being taken and split to make her own game, so now there are two. Basically GG's game "Heroes and Villains" will be pretty close to CoH in the way it functions, the other "The Phoenix project" will be closer to what CoH2 might have been.
H&V is using the hero engine, TPP is using the Cry(sis) engine.
I'm doing a bit of design work for TPP in 3 areas (while making the odd hopefully helpful comment on the H&V forums).
Currently working on
1. Making the market functional and less easy to exploit than the CoH one
2. Factions and alignment
3. The character selection screen (when you have a max of 4K toons on a single server, how do you find the one you want ?)
If anybody else is interested in getting involved, the Titan network
http://www.cohtitan.com/ is a good place to start, from there, there's a redirect to the H&V site
http://www.heroes-and-villains.com/phpb/index.php . TPP is currently migrating off the Titan forums onto their own Missing Worlds Media boards
http://missingworldsmedia.com/phpbb/ (GG caught them slightly on the hop by quitting and producing a website the day she quit that she'd been working on for a couple of weeks), but you should find their stuff split between the two boards atm.