Perhaps many on this list already know about this resource, but I did 
not until I began putting together an "Introduction to CW" program for 
my radio club.



ARRL offers online mp3 code practice files, along with their text.



The archive of 5 thru 40 WPM code practice from W1AW can be streamed 
or downloaded from



http://www.arrl.org/code-practice-files


These are the same files used on W1AW.




Mike Duke, K5XU
American Council of Blind Radio Amateurs