For all those wondering why Earl Boen didn't reprise the voice of LeChuck for ToMI even though he did for SoMI:SE , it's somewhat explained in this audio interview:
http://www.lucasarts.com/games/monke..._dofarrell.mp3
From what I can gather, Earl is now retired in Hawaii and did long-distance recording for Secret: Special Edition because of the special circumstances . The retirement explains why he wouldn't be hired to do regular recordings for ToMI.
The question is, whether he'll feel like doing recordings for a LeChuck's Revenge Special Edition or not.