Its been reorganized based on kernels the ROMs are built with.
If you flashed the Jelly Bean OTA, you can only use ROMs based on a Jelly Bean kernel. If you didn't, only flash ROMs based on an ICS kernel, or you can flash Jelly Bean ROMs made to be compatible with the ICS kernel.
If in doubt, please, please ask the developer BEFORE flashing.
Thanks to tucstwo and the administration team for helping with the reorganizing.
If you don't understand drop a line in the comments and I can help you understand it a bit better. Or whoever beats me to it will.
















