Digital camera says no memory left- how to fix w/o buying somthing else?

Download the pictures from the Memory card and / or any internal memory the camera is equipped with onto your computer.... then clear the images off the card / format it. Problem solved.

Delete the pictures on the card

look at the settings and find the picture size if its at the highest resolution shrink it if its at the lowest there is nothing you can really do about it except delete pictures or get a new memory card

Delete, download or print out the pics from the camera.

Well you should download your pics on the computer and save, then delete all the pics on your camera. Other than that you can buy another memory card (not very expensive).

Delete the pictures that you presently have on the camera. Also, if you don't have a memory card - get one. The internal memory that comes with digital cameras is not very large. Get at least a 1 Gig card. You can get them for under $100 now at most electronics stores (Radio Shack, Best Buy, Circuit City).