SanDisk is making something called "iNAND" which appears essentially be an SD Card that's soldered down to the PCB. Here's a link:
One of my projects would be significantly easier to manage if I could get my hands on this, but I can't find it from any of the major distributors. I'm thinking that most (all?) of the production is locked up in smartphone & tablet manufacturing, but it's hard to tell. I've seen mentions that it's included in one of the nVidia Tegra reference designs, but I can't seem to find a copy of that.
Before everyone says "just use an SD card!" let me say that I am, and there's a few problems I've run into that would be negated by just soldering the flash memory down on the board. I can expand on these problems if people would like, but it's not really on topic for this thread.
I suspect that I'm too small to get my hands on any of these chips, but it's worth asking. They're pretty neat, even if the functionality can be easily replicated by existing parts.