Good Banner Ad Copy Examples

[Turboguy]

Hello all,

I'm in the process of writing banner ads for automotive-related services. While I've done print-based auto manufacturer headline and body copywriting, this is my first banner ad job. I'm trying to get a handle on total word counts, differences in voice (if any), and different calls to action.

Do you have any site suggestions that have what you would consider to be well-copywritten banner ads?

Thanks,

Turboguy