This AP story on the USAT task force studying the string of deaths during races this season (NYC, IM Lou, Nation's, apparently one in Maine) has gotten picked up by papers all over the country:
I'm not a doctor, but I believe many/most of these deaths end being found to be a specific type of heart disease (hypertrophic cardiomyopothy), which can often be diagnosed with a routine echocardiogram. No matter how healthy, you owe it to yourself to get one done if you have any family history of heart disease (and maybe as you get older even if you don't). Going for a routine check up just may not cut it. I'm only 27 but just had one done last month after a family member had an issue and a few others were diagnosed. It's good peace of mind if nothing else.
If you don't have health insurance, it only costs as much as a set of Zipps:). Not cheap, but definitely worth it.