Ever since the new version of Google Analytics came out earlier this year which allowed you to do date range comparisons I have been itching for the day when Adwords would include something similar. Compared to Analytics, the Adwords reporting has been a little bit behind and hadn't been revised for some time. Now though I'm over the moon to see that they've added this feature.
See a screenshot of it in action:
You access this under the account snapshot tab within Adwords and it works in a very similar way to the date range comparison within Google Analytics. This is a big plus for Adwords and will make analysing the performance of accounts and campaigns much easier.
Note that they still have a few bugs to iron out, such as determining when a stat should be green or red. As you can see in the next screen shot where the most recent date range has a higher CPC and a higher cost/conversion. Both of those changes are green (for good!) but those are both negative changes.
Regardless of the bugs though I'm over the moon about this. I'm probably not the first to blog about this, but I certainly haven't seen mention of this anywhere else online so I thought I'd blog it.