Surviving a video slashdotting

My client hosts a bunch of cool videos that get maybe 10 hits a day, but once a year or so we get slashdotted after uploading new videos. (They're pretty cool space launch movies: http://eclipticenterprises.com/gallery_rocketcam.php) We just moved to DH and I'm trying to figure out the best way to survive the next slashdotting.

So, 99.9% of days: maybe 10 downloads/day. Once a year or so: 10,000 downloads per hour for 48 hours, of video files ranging from 50MB to 150MB.

We used to have a dedicated server elsewhere with a dedicated T-1 line, but we got very tired of paying $700/mo when we weren't using it most months (we haven't had a slashdotting since 2006).

I've thought about services that provide on-demand bandwidth, and hosting the movie files there. But I'm not familiar with that marketplace - can anyone recommend a good provider of on-demand bandwidth/file hosting?

Also, we'd like to use as much of the bandwidth that comes with the Dreamhost account as possible; is there an easy way to host the files on DH but measure throughput and redirect the traffic to an external provider if the hits start getting too high?

Thanks for any advice!

Is the content static (downloadable) or on-demand streaming?

You seem to have an idea about when you're going to be slahsdotted. If that's the case you could create a static landing page on the site for the video(s) in question and stream the content via YouTube's servers for those couple of days you're being pounded.