Anyone see a problem with using just 1 keyword per adgroup? Traffic will be less, but on the other hand it will be highly targeted..
Why would traffic be less? You just have lots of adgroups, with keyword, ad text and landing page very targeted to each other. I do this whenever possible.
If I have 8 keyword/phrases in a group, I can get traffic from all 8. Using one keyword/phrase, exact match, will not give me as much. By doing one keyword/phrase per adgroup you can have that page tailored specifically for that one phrase. You know, put the exact phrase in the header, Title on the page, etc. This helps with the quality score.