Quick update:
1) OSX GUI is almost done. I really want this to look nice and pretty in an Apple fashion. After this, I'll quickly make a windows version, since looks don't matter there
2) Embedded initramfs image is done. 7.7MB uncompressed. 4.7MB compressed. Includes a busybox linux image with shell and many tools. Everything is in RAM.
3) "Packages" are in the format of initramfs files. Since most of the system files are already in the embedded initramfs in the kernel, all you need is recovery.sh and optionally splash.png inside an external initramfs file. The shell script can do pretty much anything. I've built packages for exporting NAND over usb, jailbreaking, and exporting a Shell over usb serial. The nice thing about this system is that it's very modular. Mix and match kernels (for different devices) and packages (for different tasks).
4) Expert users can, instead of initramfs packages, load initrd images (support ext3, squashfs, cramfs) (with compression) and basically boot any linux image they want with a 64MB limit (for performance).
What I need to do now is to modify u-boot to load my custom kernel automatically and finish the GUI. Before that, I may release a command line beta for win/linux/osx for advanced users.