One simple option is github.

I use it a bit to share data and data analysis code. A few good examples of others sharing code and data on the site are listed on this questionthis question.

Benefits of github

• Easy to upload once you get familiar with git, and why not use git for your version control needs.
• You can use gists for simple single files
• It's easy for others to download single or multiple files as an archive
• It has a good amount of free storage
• source code can be browsed on the internet
• and more...

Of course, github isn't perfect for data. I can see the merits of using a more permanent institutional repository or some other dedicated tool for more serious archiving.