A friend just forwarded a great new search engine marketing tool to my attention. After just a few minutes of evaluating it in the free mode, I've added to my arsenal of search engine marketing (SEM) and SEO tools. The tool is Internet Spy (http://www.keywordspy.com).
This tool allows you to easily see how different keyword terms you've purchased are performing plus look up the keyword terms your competition is bidding on a well.
So far I've only tried the free version of Internet Spy and perhaps I'll dig into the old wallet to give the paid version a try. My first thoughts on looking at the costs are that it is a bit steep. At $19 USD for a single day, they may be pricing themselves a bit too high and when you look at an annual subscription price of $99 per month ($1,188 per year) they are a lot more expensive then paid SEM and SEO tools that I'm currently using.
So I'll stick with the free version for now, but I'll keep in mind the competitor's information that you can't anywhere else. So let me know if you decided to give the paid version a try. I'd love hear from you.