Adwords now offers "accelerated delivery"

If your budget is not enough to have your ad showing 24/7, traditionally AdWords has spread out your appearances throughout the day. They now offer "accelerated delivery", which will burn through your daily budget as quickly as it it can starting a midnight, and stop when it runs out.

This is fine for ads that have very random appearances, but I think we'd all much prefer a comprehensive dayparting ability... More.