I'm delighted to announce an upcoming free service from Linode.com: Managed DNS. You can host your domain's DNS on our authoritative-only DNS servers across our two datacenters, all managed via a web-based interface located here:
https://www.linode.com/members/dns/
This service is still pre-beta. The GUI is near-completed, but it doesn't hook into any nameservers yet.
Featureset:
Adding/Editing Zones, including TTLs on all records
NS Records - including subdomain deligation
MX Records - including subdomain deligation
A Records - including IPv6 (doesn't work yet)
CNAME Records
TXT Records
SRV Records
Slave Zones - slaves off your master nameserver
High/unlimited number of zones
Add additional DNS servers that slave off Linode's nameservers
Zone file generation and deployment
Additional zone status, PENDING, while making edits
named-checkzone report from the ns server to the GUI
Slave Zone support
This is still a work in progress, but as most of the interface is completed, I figured now would be a good time to get some feedback.
-Chris
[EDIT: UPDATED 2007-10-15 ]