It was me who resized the banners.
These are the Forum limits - they're given in James's first post on this thread:
No more than 2 banners (550px x 150px) and five lines of text (including blank lines).
Or... one banner and ten lines of text.
Or... no banner and 15 lines of text.
UPDATE:
Or... one 550x300 banner and five lines of text
Hope that helps.
