I find it incredibly annoying - not to mention outright idiotic - that any of the Dungeon Tiles should go out of print.  I mean, seriously, where's the logic behind it?  It's a good supplement for both the RPG and the miniatures game, which means it should, theoretically, help promote the sales of both, just as those products should continue to supply a demand for the tiles, both among newcomers and for those who've worn out old sets through repeated use.  Do they really need to be a limited time product?  Do we really need friggin' collectible tiles?  Will they stop producing copies of the Monster Manual once they have a second and third and fourth installment out?  Where's the sense in that?

Once I saw what it would cost me to pick up the older sets of tiles, it made it easier to just dismiss the idea of even bothering with them altogether.

Besides, I kinda wish they'd gone a step beyond just pop-out cardboard tiles.  One of the things I always disliked about the DDM tiles was the fact that it was too easy to knock them around.  For the Dungeon Tiles, I think it would have been cool if they'd made them similar to refridgerator magnets, with that thin layer of magnetic backing, and offered fold-out gameboards in a variety of sizes (similar to the old Chessex game mats, ranging from 24" x 24" to a massive 48" x 72") with a metal/aluminum top - with a 1" x 1" grid on the surface that could also be written on with dry erase markers - that the tiles would stick to.  Then the tiles wouldn't move around whenever someone accidently bumped them while moving a figure across them or hit them with a stray dice roll or something.