PPC extensions at large are a great (free) way to improve visibility, prominence and overall CTR of text ads. Here's the latest "extension" in the lineup: Location Extensions.
I could see this being valuable / a solid reco for local storefront clients (e.g. Face It, Renaldo's Pizza).
Location extensions help drive in-store traffic by showing supplementing your traditional ad text with business address, phone number and map marker to shoppers on-the-go.