I mined some of the other ones but the reward was too low to make it worth it.
It was worth it for a while with FTC, but I've gone back to LTC. I still get the fun plus a little profit.
I'm trying my hand at DGC right now since it looks to be doing pretty well ... I set up a site the other week to help show how they all compare and what your estimated earnings might be with your hash speed - www.WhereToMine.com