A lot of the ideas that I incorporate into my remote and camera trapping photography are from the blog and user forums at http://wildlifecameratrap.com
When I started using remote cameras for capturing wildlife, I built my own using a common motion sensor. I documented this project in the Simple PIR DSLR Camera Trap Instructable which finished second in their 'Using Sensors' contest.
Built on experience learned from the Simple PIR DSLR Camera Trap, I added an Arduino and published a second Instructable, Building an Active Infrared DSLR Camera Trap for Wildlife Photography, which also finished second in their 'Photography' contest.
All of my remote cameras and strobes are older systems that I was no longer using. The Canon 40d and 50d are over 10 years old having been replaced several times over the years. Using the cameras in a controlled environment without the need for faster shutter speeds or high ISO, these cameras produce impressive images.
The Nikon SB-25 strobes, first released in 1992, provide the bulk of the off-camera flash in my outdoor studio.
Modded Pelican cases and PVC tubes provide excellent protection against wind, rain, and snow. Since investing in weatherproofing my sets, I have yet to loose a system to the elements.
Battery life and exposure to the elements are the weak points while camera trapping with DSLR cameras. Over the course of developing a workable solution over the past three years, I now have a reliable maintenance-free system that I can leave in the field for over 4 weeks.