Directory and Geo mashup plugin

I'm building a directory site for a client and the main thing they are focused on at this point is haveing the listings on a map. Geo Mashup is the closest I have found.

Does you Google map plugin allow for a large map on the front page with all the listings on it?

Is there anyone with experience integrating Geo Mashup and the directory plugin? Any Advice?

I can probably get it to integrate with a location custom field, but how do I get that field to show on the front end form?

If I wanted to have separate forms with different fields for each category, where would I start? Is classifieds a better fit for that?

Lots of questions< I hope I'm not overloading one thread.
Let me know.
thanks for all the help
Richard