Agree with CD and 152047 - my cycle to and from work is my "me time" and it's a whole lot more pleasant if I let the idiot behaviour of fellow road users just wash over me. There are times, however, when it's very difficult, especially if they have just tried to run you over. Red light jumpers and pavement cyclists do the rest of us no favours at all and on the few occasions that I've challenged a cyclist about it I get told to F off so I've stopped bothering.

That said, nothing wrong with being helmetless and wearing black! I do wear a helmet but am acutely aware that it will only be of any use to my noggin in pretty minor incidents - and as for the people (and it's mostly small children) I see wearing helmets at a jaunty angle - they (or rather their parents) probably don't realise that unless it's strapped on properly they may as well be wearing a flat cap for all the protection it offers.

I agree wearing black is an issue if it's night and the cyclist has no lights, but as long as you have decent lights (I'm paranoid and have 4 front and 3 back...) then all black is just fine!