I have moved over to Diigo as well but have only found out what I could be doing from this blog post!!! My maion reason for movingf was that I can create distinct groups while still auto posting to Delicious, cutting out bookmarking in Del and Diigo....
This list of web tools is ideal for anyone working on a group project, whether you're looking for task management support, scheduling and calendar organization, or just a place to collect all your materials and brainstorms.