I'm not here to say either medium is better (they both have their advantages and disadvantages) but for a longer trip of 1-2 months on the AT I cannot help but wonder which set to bring. It will either be a film or a digital SLR with 3 lenses.
Digital Advantages: Well, first off I can instantly review my photos. I can instantly delete those photos which I decide to not keep. This means more memorable and higher-quality photos. Also, four 2GB cards will get me 2000 photos but weigh the same as a 36exp. roll of film. Lastly, I will have a range of choice of ISO settings to choose from which will allow me to adapt to changing light conditions.
Digital Disadvantages: My digital camera weighs more than any other camera I own. The problem of batteries also comes into play. Because I have the grip for my DSLR, I can use AA's which makes resupply a viable option. However, enough AA's to last me 5 or 6 days (somewhere around 12 to 16) takes up space and a lot of weight. Lastly, my DSLR cost a lot of money and is an important investment to me, so losing it or damaging it is not an option.
Film Advantages: The camera weight is less. If I lost or broke my film SLR, it could be replaced easily. It provides high quality photos, especially in b&w film. As far as batteries go, two of them would easily last me the entire trip. No worries about battery weight or resupply.
Film Disadvantages: The weight of the film is HEAVY compared to a memory card. Also, my ISOs will be limited to that of my film. Lastly, I wont see any of my images until well after I am off the trail. There is the option of 1Hour at a grocery store- but I don't trust my film to grocery stores anymore.
At the moment it looks as if I will be bringing the digital. I will have to take extra precaution to prevent water damage (it WILL rain sometime while I'm on the trail). Any thoughts or ideas are appreciated. (Note: I WILL be bringing an SLR system so that I may get the quality and control that I am accustomed to)