To help ease my SIDS fears, I've been doing a little research. I found some great information here and here on prevention and risk factors. Here's some info on how the incidence of SIDS has decreased with the introduction of the "back to sleep" campaign. And, here's some additional information on speculated causes of SIDS, very interesting.
Eric also recommended that I take an infant CPR class. I have been trained in the past, but it's been awhile and I definitely need a refresher. Jennifer F. just posted a link to a video demonstrating infant CPR that is very helpful until I can get to a class.
I hope this information can be of help to someone else, too!