"Professional" websites that have music on them.
Along with this one, Flash websites drive me crazy as well. They take so long to load, and are a pain in the you-know-what to navigate around.
I like simple, dead simple for a website. I hate flashy stuff.
Pet Peeve #2 - People who post full size 10 mp images in forums, especially when they say, "Tell me what you think?"
Pet Peeve #3 - Sticking with photography, people who categorize cameras as either dSLR or Point and Shoot only. My digital camera is neither of those.
And finally - Snow! No, I do love snow. It's the drivers here in Pennsylvania, where you are expected to..... get snow! We get 18 inches of snow, everyone forgets how to drive in it. If there is snow for 3 days, we are ok, people begin to remember. Then it gets nice for 3 days and dumps snow again. In just 3 days, everyone completely forgets how to drive in the snow!
Ok, one more. The US automotive consumer. I need a new car and I guess I will be stuck with something used. Everything available here is automatic! Automatic transmission, ABS, traction control, stability control, climate control.... Heck, I can't even put my wife's new vehicle in 4wd when there is snow on the roads. The 4wd is automatic. I can't stand being forced to run the AC compressor in 5 degree temperatures because I don't want the HVAC system blowing directly on me. If I want to dehumidify the air, I'll select the AC button myself! I'm not that stupid that I need it to be forced upon me!