I have reason to believe I've found an example of one player w/ multiple accounts, evidence as follows.
(Game 1640)
2006-02-02 18:07:47 - Game has been initialized
2006-02-02 18:07:56 - apwessen receives 3 armies for 10 territories
2006-02-02 18:08:05 - apwessen deployed 3 armies on Argentina
2006-02-02 18:08:13 - apwessen attacked Peru from Argentina and conquered it from jrosen
2006-02-02 18:08:36 - jrosen receives 3 armies for 9 territories
2006-02-02 18:08:38 - apwessen fortified Brazil with 4 armies from Peru
2006-02-02 18:08:48 - apwessen fortified Central America with 2 armies from Venezuela
2006-02-02 18:08:59 - apwessen fortified Middle East with 2 armies from Ukraine
2006-02-02 18:09:03 - jrosen deployed 3 armies on Japan
2006-02-02 18:09:10 - apwessen fortified India with 4 armies from Middle East
2006-02-02 18:09:15 - apwessen gets a card
2006-02-02 18:09:23 - jrosen attacked Kamchatka from Japan and conquered it from yeerkkiller
2006-02-02 18:09:35 - Charbroil receives 3 armies for 10 territories
2006-02-02 18:09:44 - Charbroil deployed 3 armies on Northern Europe
2006-02-02 18:10:34 - jrosen attacked Yakutsk from Siberia and conquered it from Charbroil
2006-02-02 18:10:41 - Charbroil attacked Ukraine from Northern Europe and conquered it from apwessen
2006-02-02 18:10:55 - jrosen attacked Irkutsk from Mongolia and conquered it from apwessen
2006-02-02 18:11:29 - jrosen gets a card
2006-02-02 18:11:41 - Charbroil fortified Northern Europe with 2 armies from Egypt
2006-02-02 18:11:54 - Charbroil fortified Northern Europe with 1 armies from Great Britain
2006-02-02 18:12:11 - Charbroil fortified Northern Europe with 1 armies from Southern Europe
2006-02-02 18:12:20 - jrosen surrendered
2006-02-02 18:12:24 - Charbroil fortified Eastern United States with 2 armies from Quebec
2006-02-02 18:12:37 - Charbroil fortified Quebec with 4 armies from Eastern United States
2006-02-02 18:13:01 - Charbroil gets a card
2006-02-02 21:07:20 - yeerkkiller receives 3 armies for 9 territories
2006-02-02 21:07:32 - yeerkkiller surrendered
This is in TURN ONE, mind you. Granted, it's not real proof, but it's definitely pretty damning against the last player, apwessen. Furthermore, in another game (Game 1641) w/ yeerkkiller, he also surrendered on his first turn. Whatever it is, something is going on with this guy.