I love bringing along some of those blue nitrile(sp?) gloves. Great for working on the chain or other gunky stuff. I also bring one each of brake and shifter cable. Real spokes and nipples along as well as a cassette removal tool.

In my opinion.... mine. The biggest potential problem you will come across is wheel issues. It's nice to be able to fix a wheel if need be. Broken cable would be second on my list and third would be Chain. I have the tools to fix all of the above. I can pretty much take everything apart with my tool kit but the bottom bracket. One folding tire.

On my last tour I would have many days between even the most sparse bike shop.

A quick link or two can go a long way.

Everything else has been pretty much covered above. When riding local I take a small multi tool. No chain tool. No frame pump(co2 instead). blue gloves(again) and of course tire levers. And last but not least..... cell phone.