Off the top of my head all Apple Airport Express/Extreme/Time Capsule routers, DLink 601/655/855, linksys WRT610N/E3000. All support IPv6, most of those let you configure the router as 6to4 or 6in4 (tunnelbroker, etc) tunnel endpoint as well. The DLink ones even support a stateful DHCPv6 server to provide specific v6 address ranges to your LAN clients.
The support on the most recent revisions often isn't just limited to firmware either. The Dlink routers have IPv6 ready logos on the box and instructions for IPv6 features in the manual. You can pick these routers up in your local Best Buy or Office Depot and the v6 support is not limited to the high end ones either.
I am sure there are more than those that I have listed, they are just the ones that I have personally used for home IPv6 stuff.
Sorry, I meant DIR-615/825 not 655/855. You are correct, the 655 does not support IPv6 at the moment. According to Dlink support forums in 2009 there were plans for the 655 to get upgraded but I haven't heard anything since.
Note: the way Dlink has done the IPv6 upgrades on the other models is by releasing a new hardware revision. So DIR-615 Rev C,D, and E supports IPv6, but Rev A and B don't. =\
DD-WRT firmware supports it in certain firmware versions. A little start up script hacking is required, but, you can setup a ipv6 tunnel through hurricane electric or one of the other tunnel brokers.
