What is it?

Made it back from training with a head full of information. Now I wonder if I can apply it to my job! A long & tiring three days for a homebody like me.

While at my usual birdwatching & photography spot this beautiful blue bird flew in briefly. I kinda got excited, since I didn't have the camera ready, so my images are not the best. Can anyone tell me what kind of bird he is? I had just made the comment to Andy about how it would be nice to choose the color of my feeder guests. Sure would have chose this one.