>We're about to begin development on a data entry system. I'm searching for the best framework library to speed our development. Most likely the new app will be on top of some back end database. Can anyone point me to the best framework or an article that compares them side-by-side?

Not sure if there is a best framework, but more likely a framework that is best for you. Try out a number of the frameworks. Do a search on the UT for "framework" for the last two years. You will see tons of pros and cons and tips.

Also look at http://fox.wikis.com/wc.dll?wiki~CategoryFrameWorks
In particular http://fox.wikis.com/wc.dll?wiki~EvaluatingFrameworks