Create video content in your browser, download it, use it. Lots of customizable templates. Animation. Video bumpers. Free and Paid.
After Effects Projects, Motion Graphics, C4D Templates | VideoHive
"At VideoHive you can buy and sell royalty free stock footage, motion graphics and project files for applications such as Adobe After Effects."
"Premiumbeat.com provides high quality Royalty Free Music for new and traditional media, including websites, online videos, slide shows, DVDs and CD-ROMs..."
Music is relatively expensive but very high quality ($30-40).
Royalty-Free Stock Music, Sound Effects, and Audio | AudioJungle
"Buy and Download Royalty Free Music Loops and Sound Effects from our huge range of stock audio for use in web, broadcast, corporate, presentation and other ..."
Cheaper than PremiumBeat.com ($10-12).
I found about Audio Jungle from Yaro Starak's blog.