The pre-washed vegetables always freak me out too....because I am convinced that they weren't washed right to begin with, so I have to do it again myself; which completely defeats the purpose!
I am guilty of buying/using paper towels, but it's mostly because I have 2 cats and a senile dog who can be prone to accidents. I live in an apartment building and bring my clothes to a laudromat when I have enough for a few loads......I wouldn't be able to deal with stinky rags sitting there for a long period of time. For that same reason I will be using disposable diapers even though I would prefer to use cloth.
My BIGGEST pet peeve are people using their car to go places that are walking distance. Other than the environmental impact, gas prices are enormous and in North America we already have an obesity problem. Why not kill two birds with one stone!
It kills me that we are going to have to trade in our small, good-on-gas Kia Spectra soon for a small SUV. I'm siding with Patti on this one- we are moving to the North (the Canadian North), to a city that is basically a basin built on rocks, and the road conditions in the winter are horrendous (icy, snow for over half the year, not the best road maintenance, etc). While our Spectra is fabulous for city driving, I don't think it will last too long in my hometown; not to mention we have outgrown it (baby on the way, 2 cats and a dog who frequently travel with us). My parents have discovered the hard way that living further north, if you have to cover a large area a smaller sedan just won't cut it

. It also kills me that public transportation there is so horrendous- right now I pretty much take the bus everywhere.
I also cringe when I see people with brand name everything- yes, I will admit that for some things it makes a difference (shampoo and conditioner come to mind.....but I have difficult hair to begin with), but for god's sake, things like baking soda, pop, peanut butter, etc? Most of this stuff gets packaged in the exact same plant, only a different label is put on it. I am a HUGE fan of store brands.