Linksys almost announced the WRT600N back in January at CES. They decided not to go forward with it at the last minute, but not before exposing it enough to make its existence widely known. D-Link took a similar tack, but instead actually announced its dual-band DIR-855, which is still marked as "Coming Soon" on its website.
Well, last week Linksys finally officially unleashed its dual-band Draft 11n offering and was kind enough to ensure that we got one of the first batch. This makes the 600N the second two-radio simultaneous dual-band draft 11n router available (the currently unavailable Buffalo WZR-AG300NH is the other), which has many potential wireless LAN upgraders chompin' at the bit to spend their money.