Posting this here from reddit as this guys idea seems really interesting:
Could we combine algorithms together?
After reading kuui1's comment[1] I had an idea, but since I'm not a programmer, it might not make sense:
Myriadcoin uses 5 algorithms running concurrently to secure a single blockchain. Each algorithm has the same chance of finding the next block reward and gpus, cpus can mine along w/ sha and scrypt asics. Using a 5 seperate algorithm in this manner means an entity would have to gain the majority of hashing power of the majority of algorithms to achieve a double spend attack which means they'd need far greater than 51%
Now what if we add PoS to this, and have proof of stake coins work as some kind of referee over the miners making sure double spends and transactions cannot be held back. This way the people owning the coins can make sure the people mining the coins are doing so fairly.
This could also work to incentivize running full nodes. What if 5% of the block reward was paid out to the full nodes? Who are also helping do the proof of stake.
The Proof of stake workers could run/oversee 50% of the network while the miners run the other 50% making coins. This way if an evil entity like ghash gets 51%, they'll only have about 25%. (not sure if this makes sense)
Or maybe even forget the whole 5 algorithm thing, stick with what we have now and just add PoS on top?
http://www.reddit.com/r/Bitcoin/comments/282b18/proposal_multiple_pow_algorithms_pos_i_hope_this/