click on Reports > Create >
you can only select the following types of reports to see HOURLY results:
Ad Group Performance
Campaign Performance
Account Performance
I setup a report, see sample below, it's for Hourly Campaign report
DATE TIME CAMPAIGNADGROUP Impr Clicks
4/8/07 1:00 PM CampaignName AdGroupName1 Active Active 7 2
4/8/07 2:00 PM CampaignName AdGroupName2 Active Active 3 0
4/8/07 2:00 PM CampaignName AdGroupName1 Active Active 21 6
4/8/07 3:00 PM CampaignName AdGroupName2 Active Active 1 0
4/8/07 3:00 PM CampaignName AdGroupName1 Active Active 6 2
4/8/07 4:00 PM CampaignName AdGroupName2 Active Active 4 1
4/8/07 4:00 PM CampaignName AdGroupName1 Active Active 8 6