Looks cool. IPv6 support would be neat. Does this work with the AirPort dynamic global hostname? I put my username and password in, but since my IP didn't change since I signed up I couldn't see if it was working right.
Why do you want ipv6 support? There are already ipv6 mechanisms like mobility aren't there (although not set them up yet).
Even with a static or mostly static IPv6 address the ability to have a dual stack dynamic hostname where both the v4 (that changes a lot) and the v6 (which might change less) is still useful. It is also obviously useful as you roam between office and home and such and want to keep a hostname constant.