This summer we're experimenting with free web-based software allowing staff to collaborate virtually and at times face to face on projects. The two we've used are Zoho Projects and Basecamp. I'd put out a tweet asking if there were similar products written for the K-12 environment and got back an iPhone/iPod touch app recommendation for SimplyBox, a free browser/collaboration tool. Our teachers are very interested in using these web-based tools for collaborative student projects this fall. We began a partnership with a system in the UK this past year. We'll try to bring the project to product-completion this fall. I'd love to hear from others who've used some of these tools.