@Angry I don't think that the Linksys line Exxxx have IPV6 in the current firmware. I realize that one can flash with DD-WRT Cisco are being a bit slow with IPV6 in consumer products
My understanding is that the high-end Linksys routers automatically support 6to4 tunnels, though this is an undocumented feature. Similarly, they will obtain an IPv6 address via PPPoE on a DSL local loop when the ISP is provisioned for it. Though some other vendors (D-Link for example) have documented their IPv6 support, Linksys hasn't.
That being said, I expect that any late model consumer type router from a major vendor such as D-Link, Cisco, SMC, Buffalo, and Belkin will be easily upgraded via firmware. The makers' relative laggardness is understandable given service providers' slow adoption of IPv6. Unfortunately, the major driver for its adoption will likely be $$ vs. its obvious technical superiority and the fact that IPv4 is doomed.