FolderShare is a very cool service that synchronizes folders in real-time on two or more computers. I can work on Stata files at the office, for example, and by the time I get home the same files will be on my home computer. No more forgetting to shuttle the latest update of my work from office to home or vice-versa! FolderShare is also useful for transfering large files to a co-author. You can open folders on your computer to a guest, for example, and let them synchronize files up to 2 gigabytes in size. No more mailing of CDs! And oh yes, it’s free!