Most people like the Microb browser better than the Opera browser, though it isn't perfect. You need to install the latest firmware (available from the Nokia site, among other places) to run the Microb browser. If you haven't installed the latest firmware, you aren't up to date yet.

There is a list of repositories somewhere; there are scads of them. Someone will tell you where they are; I just browse till I find them. It's on the Maemo site.

Deciding what you want when you are running Windows and then looking for it on the N800 is like looking for someone who has all the virtues of your last girlfriend and none of the faults. It doesn't happen that way; each has its own good attributes and you have to decide if you like the whole package based on itself, not on a former package.