Whatbird.com

Don't know if anyone can definitively say what this is, but give it your best shot:

Saw it while at Shades State Park in central Indiana...   mostly just deciduous forest, with some stream running through it. 

I don't know... maybe a dark-eyed junco?

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"You can cage a bird, but you cannot make him sing."
Andy

It's got a yellow tint to it, some kind of Warbler? Maybe Pine or Wilson's or Nashville?

I magnified the image as and saw the yellow chest with a white belly...could be a Yellow Throated Vireo.

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Spem longam reseces. Dum loquimur, fugit invidia aetas. Carpe diem, quam minimum credula postero. - Horace

Yeah, my first impression was either a warbler or a vireo when I saw it.  Sorry about the poor quality picture -- it was way out of my camera's range (poor little 4x point and shoot).  Hopefully there will be a 10x+ camera in my near future.