I have never used it.. but maybe the WaveRP lib.. (its a lib for recording..)..
not sure how it all works myself.. never tried it.http://code.google.com/p/waverp/downloads/list
WaveRP is an Arduino library for recording and playing Wave files with the Adafruit Wave Shield. It records 8-bit mono files at 4,000 to 44,100 samples per second.
Use of the Wave record/play library, WaveRP, requires the following:
Arduino with a 5 volt 328 processor.
Low noise power source such as a nine volt DC adapter or battery.
Adafruit Wave Shield (version 1.1 is best but 1.0 works)
Microphone preamp. A circuit for a simple preamp is included in the documentation.
Microphone, PC type with 3.5 mm plug. See the documentation for details.
SD/SDHC formatted with 32KB allocation units.
See the readme.txt file and library documentation for more information