Traffic Travis by Mark Ling is a keyword research and competition analysis software.
PPC Bully was around for a while now and ever since the beginning it left me a very good impression. It’s one of many keyword “spying” services out there, but its functionality was always among the best.
PPC Bully is a service that allows you to enter a bunch of keywords and it would track the ads that appear on Google for those keywords. In other words, it tracks the competition. With the data that PPC Bully provides you can tell which ads were running for how long and assuming that advertisers would not hold their unprofitable ads up long, you can tell which ads are profitable. This information gives you some market intelligence as to what keywords, ads and landing pages might convert and what might not perform that well.