Nope, shouldn't have changed? Does it look a different size or different type? I've sometimes changed the font size in Internet Explorer by accident and it has made fonts look smaller on every site I visit (View > Text Size > Normal in Internet Explorer).
Nope it definately looks different in IE7 to FireFox here, and this is on default settings, i switched back to IE7 yesterday after FireFox kept crashing on me.
Yeah looks the same for me too, although I may have to investigate it if 2 people are having problems. I've not changed any code for months now, but I'll load IE7 on to my laptop and see if that does anything odd. (IE7 on this PC but all seems fine).
It doesn't look back, it just looks neater in IE than it does in FF, the font definately looks different, i may be seeing things however, as i've just completely switched back to IE from FF so most sites look different.