I started using Dvorak at the start of the school year, September 2004 and tried to use it as much as possible. This meant that I would use it when typing anything that wasn’t too long. I was still too slow to type a paper or long email in an reasonable amount of time. But now I’ve been using it ever since and have gotten quite fast, though not quite as fast as I once was in QWERTY. I can still feel myself slowly improving and once I start practicing with a typing tutor (dvorak-ng) I’m sure that I’ll get faster than I was before. Typing in Dvorak is kind of cool. It’s still a relatively obscure term. It’s fun to watch when people try to type on my Dvorak keymap. Since I deleted Windows from my computer and solely use Linux, I had gotten very competent at using the bash (similar to DOS) prompt. Relearning the tightly engrained bash combinations (ls, cp, mv, cd, uptime, grep, etc, etc) proved to be the most challenging aspect of learning Dvorak.
Here’s a really good Dvorak resource: Introducing the Dvorak Keyboard
Edit (July 1st, 2005): I’m so fully switched over to Dvorak that now I have to almost hunt and peck to type in QWERTY!