Hi all,
Thanks for the positive feedback. I'll answer your questions.
I would love an easy to configure/setup (i.e. windows interface with checkboxes, selection sets, etc.) interface when run looks cool and is also easy to use...
Most of the configuration will be within the interface itself rather than a seperate windows interace. The main reason being is I want to keep it simple as possible to set up. Once the first build is out I'll happily take suggestions though for improvement, if a lot of people want that. The interface will be enitrely driven by CP controls. (Maybe some keyboard interaction but hoping for as little as this as possible)
Will this be for VGA monitor use only, or are you looking to allow lower resolutions for arcade monitors?
I'm actually targetting low resolution arcade monitors and television resolutions.
Is this in C#? VB.NET?
C#
Feature ideas: 
"Most recently played" listing
"Most frequently played" listing
Most definately and you'll also be able to rate your game 1-5 stars too and sort that way.
One thing I would look out for is your text. You seem to have a lot of it and it is fairly small. That isn't going to register well on arcade monitors and tvs.
Works quite well on a 27" Television, I'm still awaiting though my arcade monitor. Believe me though I wont release this unless it looks good!

I should point out though that the screenshots there the text isn't in focus so is smaller if you move the stick up to the text the text wheel gets focus and grows in size.
Is it going to be used it a Cab? If so what sort?
I'm planning on building a cab, specs yet to be decided

Please keep us posted.
Certainely will and again thanks for all the postive feedback.