I love psycholist although it's so cool sounding that it might encourage idiots to aspire to be one which would defeat the purpose.

The eye-contact one is a great point - particularly on tough junctions or gyratories. The other key thing is to 'own' your lane so that you don't end up marginalised. My only problem with hand signals when steering is when something happens suddenly up ahead which requires strong braking. It's one of the few times that I think an indicator light would be useful!

I do believe that if you cycle considerately - making eye contact and raising a hand if a driver 'helps' you by creating a gap for you or waiting if you're coming through a narrow street - that most drivers are courteous in return. It is really just the potential 'SMIDSY's that you need to have that Exorcist head on for.

Bad Bingo addition
Slow cyclists who you've overtaken who then filter forward of the ASL at the next set of lights so you have to overtake them all over again.

Question for the drivers and pedestrians out there now that we're approaching dark commutes. Do you prefer flashing or solid lights on approaching bikes - and does it vary front/back? Some say that 'flashing' helps them identify that it's a cyclist as opposed to a slow-moving UFO but others that they can't judge distance with a 'flasher' so solid is preferable.