http://www.adammillerrealtor.com/canon-camera-lenses-digital/
Are 35mm film and digital SLR lenses interchangeable for Canon cameras?
I have an Canon EOS 35mm camera. If I were to buy a new Canon Digital SLR, can I use the same lenses I already have?
As long as you are using an EF-mount, yes, your film lenses will work (and also should autofocus) on current Canon Digital SLRs. Just one thing to keep in mind, depending on the model you purchase, you may have what is called a crop factor.
Canon’s XT/XTi/XSi/XS (brand new, recently announced), as well as the 20D/30D/40D are cameras that have a 1.6x crop factor (the image will appear to be zoomed in by 1.6x). So a lens that is 70-300mm will actually appear to be 112-480mm lens.
Canon’s 5D is full-frame (there is no crop factor). These are just some things to keep in mind when using your lenses.
Canon EOS 60D Digital SLR Camera and 18-135mm Lens