Quick file sharing
I came across http://drop.io/ via an article in the Sydney Morning Herald. The service is free and offers the ability to quickly and easily share files on the Internet. A short (custom) url is created for you and you can upload as many files as you want (within the 100MB limit), additionally you can add notes etc. This is a great little service that makes perfect sense when you have a need to quickly share / collaborate with users outside of your organisation.