I've converted my family and in-laws to Firefox. So far, no stupid IE support calls. :)
all the senior citizens at my church who have internet access, have come to me for help because they've fried their systems beyond recognition thanks to spyware, malware, etc. One lady had 1,748 items turn up in an ad-aware scan. in addition to an AVG scan that had 27 viruses. If they keep bringing their systems to me, I think I will begin installing firefox on their machines and setting it as the default browser.