Well, this is frustrating. Today, when I started trying a few more attempts at using uboot, it isn't recognizing mmc at all.

e.g.

mmc init
returns

No MMC card found.

Any variant of fatload mmc n:n returns
Unable to use mmc n:n for fatload

Any ideas?

As to a uBoot/multiboot mashup, that sounds really nice. I like the menu from Multiboot. What would be really nice would be if I could use multiboot and for each menu option specify which uImage to boot and parameters to use with that.