We both pretty much overestimated everything. We have to remember sales are up [slightly] in June that's the Father's Day affect, strongest for handhelds historically. There were no weekend holidays in July this year unless Independence Day falls on Friday (or Monday?) which it didn't thus sales would be a bit slower this year. I really think holiday-three-day weekends (and their sale discounts) should be taken into consideration when estimating.
Something I never hear people talk about is taking note of the dates chosen to release titles, it's usually before a sales rush/holiday weekend, but no one seems to talk about that.
We should do a study on the most "popular" release date dates throughout the year for new releases to find our "G-weeks", I mean Japan has a ton of them throughout the year.