There are times when I want to send a large image, or a video, or a program to a friend AND I don't want to make my friend sign up for anything. For example, I want to quickly send a home movie to my brother. However, I don't want to ask my brother to sign up for a photo or video web site just to see a movie meant just for him (for example, YouTube or Flickr).
Here's a web site where you don't have to sign up and you don't have to make your friends sign up: www.drop.io.
At Drop.Io, simply upload the file you want (picture, video, program, etc.) and then supply the recipient with the web site address you specify on the site. If necessary, you can even set up a password.
Very cool, very fast, and very easy.