> Backlog w/Work-in-Progress Limit:
I think the limitation of items insides lists and having cycles with limits is a good point. Often I feel overwhelmed by the amount of ideas we have. I feel most things will never be implemented and just add to the noise. It surely "looks" good (having many cards), if you present it with many different colors and images. But it really doesn't help to sort things out and do the most impactful first.
> Icebox
I like the idea of the Icebox. I guess thats similar to the "inbox" concept, where you throw in unvalidated requests, ideas, reports, etc.
> Tagging
Internally I once suggested we should tag by impact and effort score (reddish tones for impact and blueish for effort), but this escalated quite quickly into a rainbow of cards, just adding to the clutter. And it feels like our product manager decides entirely from his gut feeling. Maybe tagging is just noisy in Trello.
What's your experience, can you "over-tag" cards? Does it need a limit? Or does it work better in say Pivotal Tracker?