Farside847, I just wanted to correct the above info, which is not really accurate. The suggested limits are those shown below. Please note that many advertisers routinely exceed the suggested limits, and have no account problems. But also be aware that when the suggested limits are exceeded, there is the chance that one may encounter account navigation issues - typically, increasing slowness.
The suggested limits:
* Suggested Max of 100 Ad Groups per campaign.
* Suggested Max of 750 keywords in a single Ad Group.
* Suggested Max of 2000 keywords per campaign.
* Suggested Max of 50,000 keywords per account.
BTW, I really appreciate your understanding of the need to keep the system light on it's feet - for the benefit of all advertisers, over time. Many thanks!