Originally Posted by rowan

Canon has an inexpensive wireless remote available that will work with the lower end DSLR models. Mine cost about $USD25.

1. Set the camera timer to 2 seconds
2. Get into position
3. Press remote button and drop it (or put your hand behind your back)
4. Camera snaps
5. Repeat

You could do the same with a wired remote but I think that costs more, and you have a trailing wire.