Like Practicalm, I also backed the Saga World Builder tiles. They come with titles that have black & white terrain features pre-printed on them, as well as "neutral" tiles. One cool innovation is that they are also including objects preprinted on adheasion film so you can add furturniture, treature, terrain features and other items without have draw them and which are removable and movable. Another innovation is that they are providing multi-platform software for managing your terrain inventory and planning your design.
Of course, it could go under-used as do my WotC dungeon tiles. Nothing beats a large Chessex mat for convenience.
I'm hoping that I can come up with a storage system that I can use the get the most out of the Saga world software so that I can quickly find the tiles I need and put them together.