People send me .rtf files with pictures in them, but the pictures are not displayed in Pages. What should I do?

Do not use Pages to open those files. Instead use one of the free word processors like OpenOffice or NeoOffice or AbiWord or a pay for word processor like Nisus Express or Mellel or many other ones.

Apart from images, Pages 3.0 cannot handle RTF files with tables either. The solution is the same: use another application.