What I am currently working on is a modified version of phoenix which runs multiple kernels with a single instance and a single work queue (to decrease excessive getwork).
I am also working on plugin support for it, so you can use various added features (such as built-in gui, Web interface, logger, autotune, variable aggression for when computer is idle, overclocking support, etc...)
This would make it tremendously easier for anyone to add features and you can still use whichever kernel works best for you.

As for cgminer support, I haven't tried it, are there any benefits over phoenix?  I may fork that instead of phoenix and make the plugin support via command-line, lua or javascript, although I find that python is much easier to code than c (especially for cross platform support).