I've made this smart contract repository with the basic UGC features (filter, sort, search, create/update).
The contract editor supports syntax highlighting for LLL, Mutan, Serpent, and Solidity. You can even chose your own theme
Contracts can be published as Public, Unlisted or Private.
The contract editor is in progress, but soon will have more useful features like storage, validation, simulation, and auditing.
You can see the new Serpent 2.0 crowdfund example
Thanks for checking it out!