GNU Typist version 2.9.3 has just been released.
I just thought I'd mention it here because ever since version 2.9 (October 2011) GNU Typist has come with Colemak lessons. The lessons are based on the colemak.typ file available on this site, but have been expanded to include frequent words, shift key, punctuation, and alphabetic sentences lessons.
I notice that the GNU Typist page on the Colemak wiki is 7 years out of date! If anyone is in a position to update it, it might also be worth me mentioning that you can download GNU Typist builds for Windows, so you don't need Cygwin to run it. I'd be happy to maintain the wiki page, if that would be preferable.