Accordance is offering this 25% off coupon good on any of their products until April 30, 2012. Also, Accordance products, modules, etc can now be purchased in the Mac App store.
I have enjoyed this guy's blog for a few years. I got the Kindle version for on sale for $5.99 after the new year but haven't read it yet. The book is based on a productivity series he wrote last year that was very good. I'm looking forward to getting to it.