We’ve revised our signature guidelines, and want to call your attention to them. Please take a look at the new Signature and Avatar Guidelines thread. (Note that the avatar guidelines have not changed.)
Here are the highlights:
Please limit the total height of your signature (including banner, tag, text, and other content) to 500 pixels or less.
Since many our talented members have been creating beautiful banners that are wider than our previous width limit, we've decided to allow wider signature banners. We now allow banners to be 700 pixels wide (the max used to be 600). To save bandwidth, wider banners must be shorter in height. The trick is, the maximum number of pixels in a banner cannot exceed 240,000. So your banner can be 600 wide x 400 tall, or 700 wide x 340 tall, but not 700 wide x 400 tall.
Clear as mud?
Don't worry, if you're confused we'll be glad to help you figure it out! 
It’s okay to have two smaller banners that add up to the 240,000 pixel maximum size, if you like. Just be sure they aren’t any bigger in total than the maximum banner size.
None of the rules have changed regarding what subjects can be used in your banner art. Just the dimensions have been modified.
One final note:
If you use a large-sized banner, please limit the number of lines of text in your signature (including blank lines) to no more than four lines, one of which may be large-size text).
If you have any questions, or would like help figuring out whether your signature fits within the new guidelines, please feel free to contact any of the Admin/Mod team.
Your banner is within limits, and your sig is less than 500 pixels high.
Your banner is 400 pixels high and you've only got 2 lines of text -- well within the 500 pixel limit.
