First post
I've only tinkered with a few coins. I still spend most of my time learning about what's out there because I have a few designs for my own coin platforms. I'm not a dev, though, so I'm just trying to absorb everything I can.
GridCoin (GRC)
https://bitcointalk.org/index.php?topic=324118.0Great idea. Uses BOINC in conjunction with PoW mining (they call it Proof of BOINC - PoB) to support grid computing power that contributes to scientific research.
The dev community is extremely active. Unfortunately, they're building a complicated beast and I personally don't feel it's 100% just yet. Very soon...but not yet.
I had an offline conversation with the creator of PopCoin (POP)
https://bitcointalk.org/index.php?topic=444745.0. If you take a look and like what you see he seems to be a very motivated young man with a vision. I haven't mined it personally.
But as I said, I'm mostly here to learn and make some connections.