As I've written quite a few PMs recently regarding this subject, just thought I'd give a friendly reminder to people about the signature sizes.
You can find the full explaination of the policy, here.Signatures will be restricted in size and content. Signatures may not excede a 495x150 pixel area, this includes all images and text used. The total file size for all images contained in a signature may not excede 100,000 bytes. Signatures that do not comply may be removed or edited by a moderator or administator.
There will be a 24 hour period for all members that wish to resize or edit their signatures in any way, after that your signature may be removed if it does not comply with the board's policy.