piano fitness hanon is very useful. 6, 5 are great for rotary training. 15 blocked, practiced daily for arm training. i have composed 3 hanonish patterns which strengthen the bridge nicely.
i'll try to upload chopin's etude op10 no4 again today (quicktime movie). speed will come, listening helps alot! needs to be more even in the 16ths.....well it uploaded but the video is not in sync w/ audio :-(