https://etherdelta.github.io - decentralized exchange is getting decent volume. Ironically the hacker dumped the veri tokens there.
https://ethlance.com - freelancer market. Looks like a place where once can earn Ether for coding in Solidity and related gigs.
http://ens.domains - .eth domain registry. Highly successful, will be integrated into the upcoming 'mist browser' release, plus a few other places (wallets & exchanges) support it already. Over 133k names registered.
Probably more I've missed.