I am using some online classifieds software from [url removed, login to view] (you can setup a demo site for more details)
I am able to create feeds to [url removed, login to view] and RSS but I would like to be able to accept feeds from other businesses within the same field.
The software uses Smarty PHP, PHP and of course MySql
please get back to me with costs and timeframes to complete. As i said before you can setup a demo website from the above site and this will show you most of what you may need to know.