Ask some people what car they drive and they'll answer "A Ford Focus Zetec 1.6" (for example). Ask others and they will say "er...a blue one?". Which is of course an OK answer - you need to know how to drive it, how to recognize it in car park and whether to refuel it with petrol or diesel. And that's probably all you really need to know for daily purposes, even if you use the car a lot.
In an interesting post on the Google blog, Jason Toff did a straw poll of his friends, asking them "what is a browser?" Some interesting results (90% of his poll knew which car they drove c.f. 50% knowing which browser they use, even though most of the sample spent more time online than driving):
Linked from Jason's post is an interesting (and entertaining) video in which someone from Google does a vox pop in Times Square New York asking people what a browser is, which one they use and whether they know the difference between a browser and a search engine. OK, if the interviewees had just been told they were speaking to Google this might have muddled them up a bit, but <8% of interviewees (not even Santa Claus) knew what a browser was. You get a strong impression that for a lot of folks Windows/Internet Explorer/Google is all part of "the blue one". Something which I (with 4 browsers on my system for work purposes) need to remember!