http://medicine.ucsf.edu/housestaff/ecg/pda.html
This is a great guide to reading ECGs, and this can also be downloaded to a Palm PDA device. Download the zip file for Pocket PCs, and then install Pluckr for your Palm PDA and Sunrise Desktop for your computer. After extracting the zip file, send the index.html file to Sunrise, and then synch your Palm PDA.