Many of us probably deal with a lot of geodata that significantly evolve over time, the need for geodata versioning mechanisms is clearly a major one in many sectors. About a year ago we mentioned OpenGeo's GeoGit project, and now OpenGeo shared their vision for distributed versioning of geospatial data. This is important stuff.
In addition to this intro, here's the 3-part series:
From their introduction: "As opposed to spatial data being be locked-up in a single machine or database, we see a future where it could live in a collaborative infrastructure that can track data’s origin and evolution, much like source code. [...] A distributed version control model can better address such problems as collaborating between users or organization, maintaining authoritative data, and enabling offline, low-bandwidth, or intermittent connectivity."