I think as programmers we have a tendency to err on the side of taking shipping too seriously, this is a lesson I have been burnt by and probably wont get sick of hearing.

another important point I think that is part of the same, design your product in a way that allows you to ship early. forget about all the bells and whistles before you launch, think of the simplest possible thing that is useful.

this is a concious process and a bit different from just losing the fear of launching 'bad' stuff.