The official blurb from the website is:
!(/uploads/solderpad-logo.png)[SolderPad](http://solderpad.com) is a place to share, discover and collaborate on electronics projects. It offers free git hosting for [Open Source Hardware](http://en.wikipedia.org/wiki/Open-source_hardware) projects. Our aim is to simplify the process of publishing electronic projects and to improve the state of the art in collaboration in electronics by raising the visibility of designs.
The site lets you create git repositories for open source hardware projects and there is a useful schematic/board viewer as well as a (JSON based) BOM list embedded on the project pages.
I guess it wouldn’t be far fetched to call SolderPad the hardware centric cousin of GitHub, which is a very welcome addition to the OSHW ecosystem.
If you have an open source hardware project, do join in the party and upload it to SolderPad!