The first half up to the Peeps were shot with a Canon EOS Digital Rebel (the first one), the later were with a Canon EOS 30D. I shoot raw, and process with Phase One's Capture One software.
For individual shots like this (rather than a full shoot of similar images), I'll hand tune each image. After I get the white balance how I want it (usually about 500 Kelvin lower than neutral, for a bit of warming), I'll totally desaturate the preview so I'm looking at B&W. That's where I'll do the tonal balance. Then I just move the saturation back up to about 105% for that little extra pop.
I've tried Aperture, and Lightroom, along with DxO, and a few others. Nothing comes close to the "film-like" look I get from Capture One.