I'm of the opinion that in most cases pet birds should have their wings clipped. Several of my regular customers volunteer for our local birdy rescue and they have told me that more han half of the small birds they get in are "oops" birds that just happened to get loose the ONE time someone didn't shut a door or something. I would be scared to leave a bird fully flighted.

This is the rescue BTW...I love browsing their site.

http://www.mickaboo.com/