Terrible menu structure - after finishing a lesson you must exit out to the main menu rather than just selecting the next lesson, and no option to repeat the lesson. Very loud & annoying mistake noise, just awful. The games all only use the entire alphabet with no way to tailor them to your level. So you can't use them until you know all the letters.
I highly recommend the free "Bruce's Unusual Typing Wizard"
Version 1.8.0 of Tux Typing has been released and is available for download at this site. This release includes many new word lists and lessons, as well as all-new high-resolution background images and new music files for the "fish" game. Additionally, Tux Typing 1.8.0 includes the first public release of the new word list editor from GSoC 2009 - it is now possible to create custom word lists from with Tux Typing itself.