depends on the resolution you use.
go to www.steves-digicams.com and go to reviews. look for your camera and at the bottom of the first or second page should be a table with everything
For a 5 megapixal camera can anyone please tell me how many images can be stored on a 256 MB memory stick?
Thank you!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic