One of the interesting things that came up in that discussion is Virtual Jury, a service of Art Fair Sourcebook.
You choose your juror, send in your images and receive feedback. Of course, choosing the right juror is important. Should you choose someone in your field, or outside? Someone whose more well known?
The cost is $69.50 for regular and $99.50 for deluxe. Could be a small price to pay if it helps you get into the shows you want to be in.
Another resource for improving your jury slides is the Bruce Baker CD “Your Slides and the Jury.” I haven’t seen this one personally, but at only $15.95, and with Bruce’s track record and having taken his workshops and seminars, I feel completely comfortable recommending it.