I just pushed a new devel release to our mirror. Quoting the main changelog:
updated to kernel based on 2.6.28
grml2usb: initial public version of the redesign, providing multi-ISO support and many more features, check out grml.org/grml2usb/
persistency feature: booting with bootoption 'persistent' activates a feature providing persistency for the ISO (so you can store all your changes on a partition and re-use them- cool, or?). Check out live-initramfs.en.7.html and live-snapshot.en.1.html (search for 'persistent' and 'live-rw') until we have our own docs/instructions available. Note: Any help in this area is highly welcome!