The site that was going to be moved to the UK but now is staying in the US with a different company was using closer to 5-7tb a month, serving 4.5gb DVD ISO/VOBs (Burn your own DVD), Streaming Video, and Downloadable WMV/AVI/MOV, they was just planning to do Webcam sessions and Bluray downloads so was expecting BW to rocket. Rackspace just seemed bewildered that we needed more than 1tb of bandwidth that comes with the servers as default.
They ended up going with
Managed Hosting and Application Management Solutions - NaviSite who had CDNs, video platforms etc all ready to rock.
Burning your own DVD is going to be the next big thing