I promised myself I wouldn't do it but I have. I've modified the layout to suit my typing style better. And to make it easier for Gentoo users, I have made some ebuilds for Colemak and my slightly modified version: Culemak.
Is the colemak layout really optimal for what I need to do? Today I went looking for some cold hard facts.
Lesson 5 brings 'p', 'l' as well as all the home row.
Current progress: Lvl 4, 134 cpm, 26 wpm, 88% accuracy; working on Lvl 5.
Three days in and I'm using the full home row.
I just graduated to Lesson 4 in KTouch so now I'm using all the keys on the home row in lessons. Typing speed in general is improving too. Today I didn't look at the new layout once and was able to visualise the location of most of the keys in my mind. It feels like I'm making real progress.
Things that still catch me:
After a failed attempt to switch to the Dvorak keyboard layout, a recent posting on Slashdot has got me looking at alternative layouts again, this time at Colemak.