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the new coin primer- mentioned is a prime based one, and those are really hard to accelerate.
I'm beginning to think dcrypt is no longer a CPU-only algorithm, judging by the concentration of hashpower of the past few days in a few addresses. we might need to come up with a new one hmm. as someone mentioned recently, the assumption of the unbounded scratch space is not true (i.e. you only need a small fixed amount of memory if you are willing to make certain trade offs), and it's operation intensive rather than memory intensive.
Gapcoin helps to find new Prime Gaps and is similar to Primecoin in many respects. Both projects are interesting and unique from a mathematical and scientific perspective.
I'm currently mining Gapcoin and Slimcoin (and sometimes some Primecoin too).
Slimcoin is mostly interesting from an economic perspective in terms of crypto innovation. The Slimcoin developer did a lot of really 'smart' things with this coin to make it different and it remains so.
If you look at Slimcoin's posts - he perhaps didn't really want this coin to have a pool and the choice of the unique dcrypt algo has certainly helped and somewhat hindered this coins progress in this regard. Other technical oversights have not helped with the situation or with Slimcoins adoption.
Lets put it to a vote to switch algo then - the logical choice being SHA-256 like Bitcoin and Peercoin. I think I would actually vote yes on that.