I almost switched to colemak, but decided, I preferred Dvorak's philosophy more. At the moment, though, my windows keyboard is in QWERTY, as it only gets used for gaming and typing URLs.
Make a note of the key combination you use to switch between layouts, as it was very useful to me when I learned.
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Playtrumpet: That's the second time I've seen the A Basic Course in Dvorak posted, I'll have to check it out again.