Say a development team includes (or makes use of) graphic artists who create all the images that go into a product. Such things include icons, bitmaps, window backgrounds,
A free and slightly wonky solution is Adobe version Cue its comes with the Adobe Suites up to CS4 and is easy to install and maintain. Offers user level control and is artist friendly. Adobe has discontinued support though for it which is a shame. Adobe Bridge acts as the client between the user and the Version Cue server. If used properly its an inexpensive solution to version control. I use CS3 version cue with CS3 Bridge. Works great for small teams.