I had seen this query asked in the scots-l mailing list. Besides the thread here, I found the following via Google.
Here's some more links to check out:
MP3 To Mid Converter - Wave to Midi ,MP3 to Midi, Audio to mid
Download of a program for Wav to Midi conversion:
Music Master Works
Same question was asked here:
How to convert Wave to MIDI
Freeware Wave to MIDI?