Soocial is a free web service that provides a central location for all of your contacts' phone numbers, email addresses, and other information. If that's all Soocial provided, it wouldn't be that interesting. But Soocial goes a few steps further and allows you to synchronize your contacts across multiple platforms, including your cellphone, Mac, PC, and Gmail.
Quarkbase is a free tool to find complete information about a website. It is a mashup of over 30 data sources and many algorithms gathering information from Internet on various topics like social popularity, traffic, associated people, etc. e.g. http://www.quarkbase.com/show/microbiologybytes.com
Adobe AIR app that lets you display items in your RSS feeds in a scrolling ticker on any edge of your screen. Not for the faint of heart or the information averse.
Free transfer for files up to 2GB for free, password files, customize how many times each file can be downloaded and how many days it will be available, ZIP and encrypt multiple files.
G. Little, L. Chilton, M. Goldman, and R. Miller. HCOMP '09: Proceedings of the ACM SIGKDD Workshop on Human Computation, page 29--30. New York, NY, USA, ACM, (2009)