A few comments:
I have a Minolta 450 SLR and a Canon S200 Digital Elph. I carry both with me on climbs. I use the digital to capture the fun shots and set up shots, etc. I use the SLR for the shots I think are gonna come out good. I've found that digital (or at least my camera) doesn't have the same exposure latitude as a film camera. I like using both, the Canon is small, light, and durable, and it still takes decent pictures, but when I know I have a good shot I break out the SLR.
I've heard vastly different opinions on what 35 mm film is equivalent to in terms of megapixels, anywhere from 5 or 6 to over 20, so I'm not sure what would actually be comperable. Right now I'm not convinced that digital is anywhere close to the detail and quality of film.
I think one of my friends said it best (he's an amateur photographer and shoots a large format camera). When I mentioned I wanted a digital SLR, he said something along the lines of:
If you want your pictures on your computer, get a negative/slide scanner. When you take a digital picture, you lock yourself into the current technology. 10 years down the road, camera technology will be significantly better, but your pictures will be stuck in this technology. With a film camera and a negative/slide scanner, you can always rescan your negatives/slides when the technology improves.
Regarding digital projectors, the resolution on them is absolutely nowhere near where a slide projector is, and it will be quite a while before they even come close. Right now projectors are typically 800x600, 1024x768, or maybe even 1280x1024, but even the last one is only 1.3 megapixels. If you want to show your pictures with a projector, you'll want to shoot slides rather than digital.