I gave a 3-hour "intro to Haskell" workshop at the Strange Loop conference, on September 18, 2011. These are the slides I used, with a couple of post-workshop bugs fixed.
You can read the slides online here.
They're formatted from Markdown to HTML using John MacFarlane's fabulous pandoc tool.
Feel free to use them yourself, but if you do, please give attribution to me. Thanks!