Hopefully, the new design and various upgrades to go with it will be online possibly by the end of next week (or at some point before Christmas at any rate), so the forums will be changing to the new design too.
As you will have noticed, the forums are now fixed in width on the new design and as such there is now approximately 200 or so pixels less width available for your signatures before they start stacking vertically and become obscenely large. (For most people on a 1024x786 screen)
If you're unsure whether or not your signature will do so once the new design goes live - post here to check, and if you're still not sure, other people can decide for you.
When the new design goes live - regardless of whether you decide to continue using the old forum design in its place as a personal preference - your signature must conform to fitting neatly within this design. If it doesn't, you will receive a warning and have your signature removed.
Ideally, the maximum height of any signature should be little larger than the height of an average TCM Trainer Card.