Opera 10 Release Candidate is now available for
download!
If you're new to Opera, and interested in added security or increased functionality, here's a couple of links/recommendations to get you started :-
Opera Wiki (customization and tips)
Custom buttons (e.g. javascript on/off ; open in IE or Firefox)
FlashBlocker
Fanboy's Adblocking list
DropMyRights
Some of these customisations require a little knowledge regarding the default locations of files etc. but none of it is difficult if you follow the instructions.
Have fun!
PS. When I wanted to use custom icons with my added custom buttons I found the info on this site very useful to get me started -
http://www.aimwell.org/Help/Buttons/buttons.html