Windows: IE, Linux: Chrome, OS X: Camino
IE sucks for one reason: ActiveX. Sure, it makes for some cool MSN integration - "Click here to add XXX to your buddy list" - But honestly Microsoft, is allowing a wb browser of all things complete control of the machine a good idea? ><
Chrom(ium)e, well fine on Windows, just doesn't integrate well with Linux. Slooooow. And those ugly Window buttons omg ;;
Camino doesn't really have anything bad about it, but it's just not up to par with Safari in terms of speed.