In other words, this site is pretty safe...
The useful information after a crash are available in the console app. Not only does this app keeps all the crash history by date, but it also constantly gives information about your system.
First we need to launch the console.app located in the folder '/Applications/Utilities' in your root folder.
After launching it you should see a window like the one below.
This part of the console constantly output logs about the running applications, sometime when an application crash the key information is there.
On the toolbar you should see a 'Show Log List' button. Clicking on it reveals the list of logs available, usually with the name of the application, and the date.
If you select one of those logs, detailed information about the crash is displayed on the right panel.
To email the log the best is to control-click on the log.