I read up a little bit on this because I am interested in possibly snapping some pics, but I am no expert and I highly encourage you to do your own research as well.
1. Get a pair of glasses that will protect your eyes from the increased strength of the sun during an annular eclipse, sunglasses will not cut it. Also the pin hole things work, but seem pretty difficult to use, especially if you plan on taking pictures.
2. Buy or rig up some type of solar filter, it will save your camera's sensor and allow you to take much better pics.
That's really all I've got, I didn't really find a definitive answer if it will fry the sensor in a DSLR, but I assume it can't be awesome fore it. I'm interested to hear from someone who has photographed one before!