Stunning news from Bosque del Apache NWR in New Mexico: a female Sungrebe was photographed there on 13 November 2008, those photos here. It was correctly identified on 17 November from the photos, then refound and photographed more on 18 November. This is not only a new species for North America, but a whole new family.
A map of the species' whole range can be seen here at InfoNatura (scroll down for the detailed map).
Of course, birders are already debating whether this is a wild, naturally-occcurring bird or an escape from captivity. On one hand, it's a secretive species that is rarely seen flying, with no known history of vagrancy or even real seasonal movements, making the prospect of one appearing nearly 1000 miles northwest of the closest known population seem very unlikely. On the other hand, it's not kept in any zoos, and doesn't seem like the kind of species that would be illegally transported by an individual, which makes the escapee theory unlikely also.
Tipping the balance in favor of natural occurrence, in my opinion, is that in South America Sungrebes are apparently quick to occupy ephemeral wetlands, even when those are isolated many miles from any other suitable Sungrebe habitat. So clearly they are capable of long-distance flight, and wander enough to discover recently-created habitat. Perhaps, like rails, or Masked Ducks, they are capable of amazing feats of vagrancy.
Unless there is some clear evidence of captivity, I would consider this a wild bird. Incredible!
Update 19 November: Jerry Oldenettel has more details and will be updating the bird's status on his website here; and apparently the original photos were taken 13 November, and identified on the 17th, so the bird has been present at least six days.