I think for shooting my art work, I would still shoot slides because they could be converted to digital when needed but I have something that lasts for as long as I want. For the webpage I shoot digital, only when I sell my art then I take it to shoot slide professionally before giving it to the client. I think in commercial photography, it's got to be digital, because the whole structure of magazine publishing is all digital now. I can't imagine no one has figured out how to preserve the digital images at this point, or ways to convert digital to latest format for preservation sake.
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Well, going back to film is an option, but I foresee two major problems; 1, How long will it be economically viable for manufactures to keep making it. 2, You're seriously hampering chances to get work out there. Everyone wants digital images, not dupe transparencies. Newspapers/ magazines/ ad agencies may accept it a couple of times, but in every industry speediness is key. Somewhere along the line you're going to have to surrender and get some of your work scanned.

I think the most pressing issue is to respect the digital format. Most of us do not fully understand the technology yet we intrust it with our live(lihood)s. There are groups like the Digital Preservation Coalition- http://www.dpconline.org
promoting awareness through international research. But, although it's provided me with a lot of help it's not very inviting.

This is a major headache...and one of my greatest fears. Ultimately a hardcopy like a negative or a transparency will be almost foolproof but it could be hard to comply to using film sometimes. Digital storage is easy but retrieval in the future may pose a problem with compatibility..

I still shoot everything on film and then transfer to digital. The cost on processing has become very expense. Shooting on medium format, I have to try and make every image work. Of course you do not have this with digital. As also mentioned a while back the thought process on getting rid of mistakes comes in to play also. On digital an instant decision could mean that you get rid of something that could have been used for effects at a later date. There are pros and cons for both I know. The thing that holds me back more than anything is costs of materials.

Using various storage devices to back up your files is definitely recommended. As long as dvds, cd-roms are kept in optimum conditions (cool, dry, out of direct sunlight etc) then they are pretty reliable. It is very important that you keep a system of opening up files on the dvd. 'Refreshing' is also encouraged, copying data from current DVD to a new one.