Make sure to use your king! When all else is equal, the side with the more active king will get the upper hand. If you're unsure how to evaluate a knight endgame, try to see which king is closer to the center or queenside -- the closer king will be able to contribute to the action first.
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[Event "World Cup Tournament"]
[Site "Tromso, Norway"]
[Date "2012.??.??"]
[Round "?"]
[White "Michael Adams"]
[Black "Wan Yunguo"]
[Result "1-0"]
[BlackElo "0"]
[FEN "r1bk1r2/1pqnbQpp/p4n2/6B1/2B5/5N2/PPP2PPP/2KR3R w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Nd4 { A couragous and difficult move to find. White wins the exchange with
this move. Any retreat gives black a good game. } 1... Rxf7 2. Ne6+ Ke8 3. Nxc7+ Kf8 4. Nxa8 1-0