It's the ".opera" folder, not "opera" --- I've only tested this on my n800.

The "alert('victory');" will make it so that every time you finish loading a page, "victory" will be displayed --- simple test to see that it's working

User CSS is the holy grail for me, because I know that can be used to deliver ad blocking services --- User JS will let me port the Opera User CSS adblocking technique, however.

To get an idea of what can be done, go to userscripts.org: the first thing I want to get adapted is the All In One Video Site download link javascript from 1024k.de.