Hi Mike,
I saw this post and have been meaning to share my thoughts. Better late than never I hope!!
While I can't share any examples from my PPC work, the group that Kurt referenced at the end of his article has a nice report available on the subject, with some examples:
Optimizing Your Landing Pages
If you're creating landing pages for your PPC campaigns in particular, I think it's important to get the message you are trying to convey to match across the ads into the landing pages. I've done some with % off offers or bundle deals and they performed best when everything was tightly woven together.
If I see any other examples that I can share, I will pass them along!