Micromoneygrabbers made IE, so someone finding a security hole in it is like finding Mexicans in Mexico. To be fair they did make IE7 a lot better than IE6, that was like a big house full of goodies being located in a dodgy neighbourhood with no front door. But I can't imagine that IE will ever be as good or better than alternative browsers like Firefox etc. Having said that, I'm sure Firefox and others must get their security issues, but they don't seem to be as glaring as any problems with IE.
I use Firefox, only time I use IE7 when I have to.