bbc.com: ad specs

Interstitial

Availability	On the Travel Homepage only
Dimensions (w x h)	640x480 or 300x600 or 500x500.
File Size	40kb max Flash file and 40kb max back-up JPG or GIF.
Polite Download	Initial file size = 40kb. Total file size = 200kb (without video), 1MB (true video streaming only, progressive download must be on user click).
Accepted Ad Formats	Flash, JPG, GIF.
Polite Download	Rich-media can have 100kb secondary load file size if 3rd party iFrame tags are provided.
Animation	7 seconds max.
3rd Party Acceptance	Yes. Iframe tags only.
Execution Guidelines	1 per 24 hours frequency cap per user.
Ad Submission Requirements	A 7 working day SLA is required.