Tools and distributions for embedded Linux development

From what I've read the write speed performance of the SD card will gradually degrade due to the lack of a TRIM function. This has become a big enough issue that Windows Vista and newer Linux kernels utilize the TRIM function on SSD drives that support it. But this function has yet to be put on SD cards (probably cause their designed for digital cameras!)

NAND flash may be better suited since the wear-leveling is integrated into the filesystem software (Flash Translation Layer).