Here you go:
How do you negotiate rotaries?
Riding group leader commands at roundabouts
And this just in:Cyclists in roundabouts--different design solutions.
An important consideration for cyclist safety is the evidence that motor vehicle drivers primarily look for other motor vehicles and therefore sometimes fail to see cyclists (Herslund and Jørgensen, 2003; Räsänen and Summala, 2000, 1998; Summala et al., 1996). While the aim of integrating cyclists with motor vehicles is to make them more visible, the above-mentioned research shows that it may not be a safer solution in roundabouts. ...
Explaining variation in safety performance of roundabouts. which notes: ... Vulnerable road users (i.e. bicyclists, motorcyclists & pedestrians) are more frequently than expected involved in crashes at roundabouts and roundabouts with cycle lanes are clearly performing worse than roundabouts with cycle paths. Confirmation is found for the existence of a safety in numbers-effect for bicyclists, moped riders and - with less certainty - for pedestrians at roundabouts."