The Google AdWords blog announced you can now set up to a 100 automated rules, up from 10. Plus, Google added a way to undo a specific automated rule when the outcome is not as expected.
Google increased the limit of automated rules to encourage AdWords advertiser to "easily try out new rules."
Plus, when an automated rule goes bad, Google added an easy way to undo the effect. Here is a help document on how to use this feature but here is how it looks:
For more details on using AdWords automated tools see the help center.
Forum discussion at WebmasterWorld.