Professional images, video, etc:
iStockphoto.com (see the coupon on page 159)
Veer.com
Shutterstock.com

Free images and more :
Commons.WikiMedia.org
www.MorgueFile.com
www.DreamsTime.com

Fonts:
MyFonts.com
Veer.com
FontShop.com
FontBureau.com
There are thousands of low-quality (but sometimes quite useful) free fonts online. Search for "free fonts"

iStockphoto.com images used:
sale tag: wragg 10511326
forklift: lagereek 3346468
turtle background: ntripp 8340053
passports: kirza 1648185
graffiti: DaiPhoto 2532985
business meeting: endopack 3138945
go-cart shopper: imageegami 10379737
elephants painting:
              polispoliviou 7184553
              Vicky_bennett 382294
              Hirkophoto 4887474
game letter cubes: 408326
game pieces: magnet creative 4190979
game, man playing: Photodjo 9267387
game, girl playing: lisafx 659308
renaissance paper: Wadders 330118