We have a Chipping Sparrow! I love these little guys so much - they're so little and cute.
A chippie actually landed on my hand two summers ago. I was refilling a tube feeder and hanging it on the deck, and the little chippie obviously wasn't thinking too clearly - just wanted food. He came flying at the feeder, landed on my hand, and you could see the second it registered with him that, "Oh, shit - shouldn't have done that!" And then he zipped back up to the tree to wait for me to go inside. It was really rather cute.
So yes, just another sign of Spring. Of course, it's supposed to get cold again Monday and Tuesday, with lows below freezing, so I'm a worried about what might happen to all the plants that are already trying to bloom. Hopefully they'll all survive okay. *fingers crossed*