I voted for Google Code because even if it's not the most full-featured tracker, it's the one with which I get non-techie users to actually report issues. Ther

I voted for Google Code because even if it's not the most full-featured tracker, it's the one with which I get non-techie users to actually report issues. There are no complicated required fields, just name and description, and it mostly doesn't require registration or login because most people are already logged into some Google service. This means that users only need to write their problem and press a button, so they actually do it instead of being scared away by the interface, which is what happened to me with other trackers.