Personally speaking, I don't really get GTD. It seems like an awful lot of work to put in to organising yourself, and as such would only add to your workload. That said, I haven't tried it. One thing I really liked the sound of though was having a 'sometime maybe' list for the things you really want to do, but realistically may not get round to. It's a good way of keeping them out of the way but not dropping them completely.