I haven't played around to much with adding listings, but you can see something we did for our condo conversion
here.
We use postlets for posting to a lot of online classifieds like Craigslist. It is easy to use and free.
My assistant has asked me to come up with a template for our listings so it's an easy upload (she doens't know any code). This is something I will have to work on over the next week and I can post the results once it's finished.
Jim if you have a template for listings it would be great to save all of us some time.