There is an email going around claiming to be from Google Adwords telling people their account has expired. Do not click on this or enter any information. Whenever you get an email with a link make sure to look up at the address bar and make sure you are on the site you think you are on. Two weeks ago there was another email that was very similar.
Excerpt from the Phishing Email:
Thank you for using Google Adwords! Google Adwords Services DEP. COPYRIGHT Google Adwords Services 2009 (C)
If you intend to use this service in the future, you must take action at once!. To continue click here, login to your Google Adwords account