Frankie gave us a heads up that today, May 23rd between the hours of 10:00 AM and 1:00 PM PDT, the monkeys over at Bungie are going to be collecting data on any game crashes that take place in the Halo 3 beta during that time. A warning will come up and it will upload logs to the Bungie servers for their testing purposes.
Those who participated in the Shadowrun beta should understand, as we would upload game logs after each match for a minute or so. Frankie reassures us that the upload should take somewhere from 10-20 seconds. Upon completion a message will pop up saying "File upload complete. Visit http://www.bungie.net/forums/halo3beta for more information (safe to reboot)." After 1:00 PM, they'll turn things back to normal, and upload time will be reduced greatly. Moral of the story? Be good fanboys and let the logs upload.
From Xbox 360 Fanboy