This is actually the first car I've owned where I tend to just set the cruise on the highway at 5-8 mph over the speed limit (traffic is usually travelling at 10+ over on highways) and just mind my own business to avoid the jerks in other cars. I've been making a concentrated effort to not be 'one of those guys' in a WRX - and it seems that in my area those SRT4s, Civic SIs, MS3s, GTIs and the like are all on the highway. I just turn on some nice music and cruise along.
This has further reinforced my logic of not getting an exhaust and staying as 'stealthy' as a WRX can - I might even end up going front mount and removing the hood with the scoop for a regular impreza hood if the idiots keep on coming.
For some reason, when I'm at stop lights, diesel trucks tend to want to race me, too. I haven't figured it out yet - but I'm glad to hear I'm not the only one.
I am going to take up the 'little girl in the backseat' wave mentioned earlier if someone wants to stop-light race when my kids are in the car - that really gets me annoyed.