I am still supporting Marscoin where I can.. I have a dedicated miner and pool running on it 24/7.
I was also one of the regular traders on Poloniex and Coins-e (before it vanished off the planet)
I also participated in some of the giveaways.
The incentive to make that 500,000mrs donation to Mars One and the Mars Society count for something one day is too strong for me ;o) as I am an Space Pioneering Enthusiast. One guy I know designs simulated ROV mars rovers (which hopefully can be linked to rentals from a Marscoin payment gateway one day) which he lets people remotely operate over the internet sometimes and he wants to form an asteroid mining company.
Not sure if helpful to anyone but my pool is here:
http://mars.our-game.net and I have a forum for marscoin here:
http://cybernexus.proboards.com/board/30/marscoin (for discussions about the pool or marscoin in general)
If you need active nodes my pool was setup as a crude sort of "supernode" with a cache of the entire marscoin blockchain when I set it up originally.. so it usually has a few active up or downstream connections linked to it.
I've tried to keep any info i know about Marscoin posted on the pool (and now the forum sticky I added) up to date.
Besides which I still hope to get an online store trading in Marscoin working at some point too one day. Be it selling Marsbars or in-game purchases. I am hoping limecart (a coin deamon based php option) can be adapted to marscoin.. as i really dont like the idea of going through corporate front ends like cointopay or the paypal crypto SDK.
If anyone knows of any current mining pools, or exchanges or online stores or just wants some coins to play with for that matter.. shoot me a message over at my marscoin forum. I'll add what I can to the sticky.
Also POS software that works in Marscoin would be nice too, the only ones I found required API access using your exchange trading logins at several exchanges, and that really sounded unsafe to me..
Cheers