Trello – disable moving cards between lists

I've just tried having two boards open at the same time, in two different Firefox windows, and attempting to drag a card from one board to another. You can even drag the card out of the first window, so I believe that the answer to your question is "No".

However, the idea is being considered, and you could vote for it in the Trello on Trello board. I see it's in the "Next Up" list, which sounds promising!

Edit

Trello tweeted yesterday (2011-11-17) that this now implemented:

NEW! Move cards between boards. Just click the 'Move' button, select a different board, and sit back in amazement.

I agree with your friend about not dividing up into separate boards by type of job.

With your examples such as 'Design ideas' etc, I think they really do fit naturally within different lists on the same Board. It's exactly the sort of usage that Joel demoed in multiple videos about Trello.

The only thing I can think of, to help manage very long lists, is to use Trello's Labels system to put categories on cards, and then use filtering. You should definitely give meaningful names to the default labels.

I wrote up some tips on how to use labels recently.

Having said that, fairly early on the Trello on Trello board got huge, and eventually they reduced the scope of it. So it's does seem to be a well-known problem.