Here is another good read (from few days ago on HackerNews) on "How Uservoice use Trello & Google Docs to make UserVoice better every day." - http://www.uservoice.com/blog/founders/trello-google-docs-pr...

We're following this rather closely and is pretty good so far. Once you master a decent tool, you can do lots with it. So, if you're an Asana guys, go with it but then if you've started with Trello, make the best of it. You do not need to get swayed here and there trying to find the best tool ready-made for you.