I haven't used it yet. My biggest need is to have something sync with my phone, which has left me at the bridge app for now.
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I use Wunderlist which is a nice cross platform todo list. Very simple and effective. The BB phone has a free app and you can sideload the Android version. I have had almost no trouble using this. Also there is a web version so you can use your desktop to edit as well and it all sync's up nicely.