I just downloaded Google Free AdWords Editor which I found great!!
Basically it is an application for managing your ad campaigns.
You can use it to download your account, update your campaigns with editing tools (online or offline), and upload your changes to AdWords again.
The AdWords Editor is available for Windows 2000/XP/Vista and Mac OS X(10.4+).
More information at http://www.google.com/intl/en/adwordseditor/.