I just finished posting some data and documentation on the Dataverse Network. This is a wonderful -- and remarkably easy to use -- resource that provides scholars with a virtual archive for their data. It allows you to make your data publicly available in a permanent format with a stable URL -- useful if, for example, you change institutions. You can even incorporate links to your data into your own website, branding the material as your own, without having to worry about hosting and maintaining it. If other scholars use or rely on your data, there is a formal citation that they can use, giving you appropriate scholarly credit.
And of course the Dataverse is a great resource for scholars who might want to replicate other people's work or rely on their data. Thanks to Harvard's Institute for Quantitative Social Science for creating and making available this resource. You can read more about it here, in a post by Gary King at the Social Science Statistics Blog.