Please spell out the month name. In many countries dates are formatted as DD.MM.YYYY rather than MM/DD/YYYY. For example, a native German speaker will have a lot of trouble recognizing that date. Especially if it is something like 8/7/2011 (is that August 7 or July 8?)
If you write the date as "August 8, 2011" it should be trivial to parse for everyone. (Except for people using different calendars)
Not only native Germans, other native English speakers, like people in the UK use the DD/MM/YY format. Unlike people from Germany, people from the UK have no language barrier, and are a potential customer.
Yes, you are totally right. But don't overrate the language barrier: I sell a software product that is English only (localization is too expensive), and the majority of my customers are from non-English-speaking markets.