There are some clips from on-ride videos at Go2orlando.com and orlandorocks.com. If you want the comlete thing check out America's Greatest Roller Coaster Thrills: The Ultimate Scream Machines on DVD or America's Greatest Roller Coaster Thrills: The Next Generation on VHS. There is great footage there. Especially the DVD which lets you switch perspectives and has interviews with Park Designers.
If you don't want to go through this trouble then let me tell you I might post the onride videos on my website when I get it finished (www.ioaguide.com).