UPDATE - 11/12/2009
I notice loads of traffic into this site looking for "Ryoma Den trailer" and I know since NHK site is in Japanese it may prove difficult to some to locate where the heck is the video link. Fear not! Thanks to a close source (this I rather not reveal since this is like supposedly copyright infringement but when we fans promote the series, how can that be?! Moreover it is just a trailer, not the whole series itself! And if there is a decent subtitled version out there with a fair price, I believe there won't be any huge torrent exchange and such!) I give to you the DIRECT LINK to the video itself. Just click it, new browser will pop up, wait a while and the video will run unless you don't have something installed. Interestingly can't find the trailer in youtube. Is it true then? Youtube fails yet again? Anyway, the link as below...
WATCH RYOMA DEN TRAILER HERE (do NOT right click to save as this is a page with embedded video!)
If nothing happens, copy and paste the URL below in your own browser.