I'm really surprised to see all the CO2 cartridges. I bought a CO2 pump years ago, it has sat in a drawer. I prefer the old hand pump - don't need extra cartridges, no worry about blowing a tube... yes it takes work and yes it only fills to ~80 lbs, but it gets me through every time.
Then again, I live in tackweed central and 2 cartridges is sometimes not enough.
Road Morph
http://www.rei.com/product/648089/to...ump-with-gauge
My kit, other than that is just like everyone else'
-patches and superglue (Rivendell sells the best kit)
-1-2 tubes (many of my bikes have 2 different tire sizes)
-Alien multitool
-tire levers

on long (century or tours) I carry extra spokes because I was told to years ago. I'm not sure I'd know what to do with them.
I also carry glucose tabs, but that's not something most of you would need to worry about.