Elledan: actually, Opera5 supports, well... everything pretty much. of course, most webdev houses only focus on the 'major' browsers (IE and NS) and unfortunately, even though Opera is an awesome browser, most houses dont bother with it... ours included.
Personally, I test all the sites we do in Opera just to see if they are at least functioning properly, and for the most part, they do. of course, when you get into DHTML and the like, thats where the problems lie... why? im not sure. If everything is supposed to be based on standards, why are they all different in the way they are implementing them?
IE throws nice little things into their browsers that add an amount of spice to a site... yes, unfortunately they only work under IE, but the majority of users are using it anyway, so its nice.
BTW Mozilla is not evil at all.
Ive got no problems with Mozilla at all. Never said it was evil.
[edit]: Correction: NS6 isn't based on Mozilla 0.9, but on Mozilla 0.6
sorry about that, i was mistaken.