I just had the great opportunity to speak with Zhaohui Tang of Microsoft. He has been instrumental in developing a really impressive key phrase research tool that builds directly into Excel 2007. I've seen it work first hand and I must say, it is amazing.
They write this about the tool:
This new adCenter tool helps optimize keywords to improve advertiser campaign ROI. The adCenter Add-in provides immediate access to advanced keyword data including market segmentation, monthly traffic, monetization, categorization, and other advanced tools. This new tool makes adCenter keyword research and optimization easy and efficient by providing unparalleled keyword information to help advertisers choose the right keywords for the right audience to capture the right customer.