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,
TortoiseSVN can show image revisions side-by-side, which is really useful. I've used it with different teams with a great degree of success. The artists loved having the ability to roll back things (after they got used to the concepts). It does take a lot of space, though.