Solution Grove is busy these days, and we are doing a lot of new AJAX-based UI work. I will be documenting and demoing it in our blog so we can make the rest of the community aware of pieces we are creating. We hope to work with the community to bring these pieces back to the toolkit, but some demos will be client-specific implementations that will probably need adapting.
This is a demo of a "Carousel UI" integrated into OpenACS to allow users to pick images.