It looks like both Ritz (at least the kit w/ 24-105mm lens has) and Adorama have begun to ship the Canon 5D Mark II.  Unless you got on the pre-order boat early, you may have to wait a bit more for the next shipment or so to come in.

Again, for those still shopping, the Canon 5D Mark II is available (depending on supply) from the following trusted vendors:

Canon 5D Mark II (body only) – Ritz Camera

Canon 5D Mark II (body only) – Amazon.com

Canon 5D Mark II w/ 24-105mm L lens – Amazon.com

Canon 5D Mark II (body only) – Adorama

Canon 5D Mark II w/ 24-105mm L lens – Adorama

Canon 5D Mark II (body only) – B&H Photo

Canon 5D Mark II w/ 24-105mm L lens – B&H Photo