More Birthdays, Events and some Deaths!
Here are some more events for which July 17th has become is famous (or infamous) over the years. Of particular interest may be the deaths of the last Romanovs.
Wikipedia's entry on July 17th
Also, something more close to my heart than the rest of you (though feel free to disclaim me), Finland's Constitution (rather recently repealed) was adopted on July 17th, 1919.