Class Packs
I think it would be really interesting if users could create their own classes, and distribute them in 'packs'. Ideally, a way of 'including' those in projects built using Titanium Packager (the suggested way of creating custom projects as it correctly handles the installation of Titanium, and the loading of custom classes) would also be created.
This would allow for a community element. "Need a class that does X? Perhaps someone has done it for you."
These class packs could be shared on the CC forums, however, a custom website could be made for their sharing. This would likely be needed when dealing with TPM and the Titanium Packager. For example, tpm install AnimationPack -pack
would install the 'AnimationPack' pack, however in order for TPM to know where the source is, the pack will need to be registered (Perhaps a Git repository that users would send MRs to?).