I had forgotten all about Pushing Daisies!
There are several shows I wish had not been cancelled. I could go on and on. I always seem to choose ones that are doomed as my favorites, I guess. LOL
There are a select few that I didn't really mind ending but would love a 'reunion' show. Private Practice is one of those, Gilmore Girls (as mentioned by so many) is another.
Cheesy teen shows are my guilty pleasure and more recently Secret Life of the American Teenager ended and had the absolute WORST series finale I've ever saw. I'd love to see either a 'college years' or a reunion show to help get past the bad feelings I was left with at the end of the series.