Here in Germany, the media - and not just the private media who's not above milking even the worst tragedy for delicious tears and emotions as long as they can, but serious tv channels and newspapers as well - are doing some specials about it, but I don't know anyone personally who was affected by it or does anything special today. Generally, there's also the notion that 9/11 spiralled into the whole war on terror, and that isn't regarded with much fondness, so there's that.
Most people remember were they were 9/11, though (I do not, because we didn't watch a lot of TV when I grew up and I was ten, so the first time I heard about it was the next day in school).
So generally, respects are paid, but the day itself doesn't have a big impact on our lifes, from what I can gather.