You probably know that Crippen & Landru publishes great reprints, but this collection isn't a reprint. As I said above, it's all original. These stories weren't done as part of the TV series, and they've never appeared in print before.
And take a look at the cover. It's by Al Hirschfield, and I'm sure you can find his daughter's name hidden in it. But can you find the hidden gallows and noose? I'm looking for it, myself.
This just arrived at Casa de Crider, but I'm looking forward to reading some of these inverted detective stories and seeing how Columbo figures things out.