UI reviews would be great - I'm sure David knows that Michael Feldstein is another user-centric person that's very much interested in UI issues.
So would HTML sketches of proposed UI changes. It would be really nice to work on the UI of a package before writing the package...
When the beta version of OpenACS 4 comes out, I intend to start putting together a proposal for a second release cycle. A couple of other folks have been contributing ideas. When there's something available, say at the end of January (I almost typed "June", boy, wouldn't that freak people out!), it will be posted as a target for all to take potshots at.
