Thanks very much, that would be very useful.
The best way to report technical errors is through the errata report page - http://pragprog.com/titles/mbfpp/errata. It’s pretty fancy, you can plug in the technical errors/non idiomatic usages there, and then I check them off as I fix them.
Typos can go in there as well, though, since it hasn’t been copyedited yet there are probably a bunch. Feel free to report them as well, but it may not really be worth your time.
But please do enter the tech errors if you get a chance, I’m aiming to clear out that errata list in the next beta, which should be out in a few weeks.