Earthlink R&D has created a version of the firmware for the Linksys WRTG54G that enables IPv6. This allows, in addition to the WAN address of your router, all of your devices in your home network to have a publicly accessible IPv6 address. This would make it easier to run a service on any machine on your network.
In order to run this software, you have to replace the firmware with that provided by Earthlink R&D. Then you have to configure the router to set up a IPsec tunnel to an Earthlink routing server.
I do like the idea that all of my network devices could be accessible from the public network, without having to setup port forwarding. I don't think that I will be installing it, since I have installed the sveasoft firmware.
The router does come with a reasonable default setting for the firewall, where it only allows ssh connections in to the LAN machines. I do have concerns about the fact that all IPv6 traffic is going through Earthlink's servers, even if you are not using them as your ISP.
[via Om Malik on Broadband]