Nice. I've been using Trello for the same purpose for some time now.
I handle emails by using the "Send to Trello" bookmarklet to create cards for any emails I need to spend some time on later. Then I archive the email out of my inbox (so that the direct link to the email still works).
My only problem is not grooming my Trello boards enough. They're somewhat organized, but I've heard it's good to go through these GTD-style lists as often as needed, in order to decide what's most important and what to do next.
Yep. It's the same with Bullet Journaling, where you try to frequently go through your to-do items and cancel/remove anything that isn't important enough to spend time on and shuffle tasks forward as priorities change.
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