EXIF

I just got a digital camera which saves all its images as JPEGs, and I'm looking for an EXIF extractor to build a package which renames photos from (for example) 'IMG0025.JPG' to 'Apr22 2004 img01.jpg' or something similar, since I probably won't upload all my images every night (which would allow me to name things using os.stat(file) instead).