I've identified two duplicate CDs (the perils of five people in the household, and not everything going in to the 'what we have' list, plus me going 'I've never seen that' when in fact I've bought it a few years back) and put them in the front hall to work out what to do with them. Am loathe to take them to the op-shop -- going to see if I can gift them to someone with the right age kids.