New alt coins are being released everyday. Some are useful; most are not.
Some Ideas for Alt Coins
1. A scientific coin
People are complaining about an large amount of computer power going to waste mining bitcoins. Well develop a coin that can take input for proof of work. Universities or individuals could submit work to the p2p network to be used in place of the normal proof of work. The work could be distributed to miners in place of the normal proof of work. Afterward the results of the work could be sent back to the submitter. Kinda like SETI meets bitcoin.
Good idea...

If you're a good coder send me a PM.