I found this booklet as an accessory to the usual typing manuals.  It helps focus on weakness in certain keystroke errors such as those hard to reach shifted upper row symbols and punctuation, and establishing rhythm and various exercises in multi-syllable words.  It has a chart on the back that lists key areas such as accuracy, speed, indentations, and so on.
[img]IMG_1680 by greg riutzel, on Flickr[/img]