Here are some of the things I'm thinking about: I'd love feedback on any/all of these!
I've added the ability to put a symbol (of your choice -- up to 255 characters) after fields that have validation rules. This symbol can be different for different forms.
I'm also thinking I'll need to modify things somewhat: currently you could have, say, "integer" validation on a field but not have it be a required field, so that if you leave it blank, it's OK, but if you do put something in it, it has to be an integer. I think perhaps there should be also a separate "required" flag for fields. If I do add the "required" flag, the symbol will obviously be attached to fields that are required, rather than fields that have validation rules.
Each form may now have its own CSS class attribute.
Each field may now have a CSS class attribute added to it. I don't know the best way to use this, though. Should it just put a div around that whole field and its title? I'd be interested to know how people would want to use this.
You can now select "Use CSS Only" in the module global configuration. This prevents it from putting any tables in its output. It will wrap all of the content in a div instead, with the class specified for the form. In this mode, field titles are wrapped in paragraph tags (with the field's class, if any is specified), but this could be changed.
I'm thinking that there should be a "pagebreak" input, which would allow you to make your FeedbackForm span multiple pages. This would be nice for doing survey-type forms.
I also intend to add some better error handling to the different Mail dispositions, and fix any outstanding bugs.
I'm thinking about things like porting it to use Smarty templates on the admin side, which probably doesn't have much effect on users. But then this opened up the idea of allowing people to create their own user-side templates for their forms. This might be something for version 0.8, since it would be a lot of work

Please let me know if there are any bugs you've been experiencing, so I can clean 'em up. This is also an opportunity to request features!