(i'm using opera 6.0 right now!)

i like opera becauser it:
doesn't take up 2953609235% of my r.a.m.
loads quickly
i like the hotlist feature (loads faster than i.e.'s favorites bar)
its small and i don't have to wait 23509 hours everytime a new i.e. version comes out
doesn't support activex
you can turn off images