http://news.ycombinator.com/item?id=123371 sounds like they're more interested in issue tracking software really. I want a time tracking/invoicing solution.

http://news.ycombinator.com/item?id=224473 is looking for a project management solution.

http://news.ycombinator.com/item?id=460677 is a developer looking for ideas and there's no relevant suggestions there.

Fair point about http://news.ycombinator.com/item?id=124856 I hadn't seen that and there are some good solutions outlined there.