Opera has been striving to break 1 percent of the browser market for years. Firefox 3 did four times that amount in just one week, according to Net Applications.
This not to criticize Opera but rather to laud Firefox 3. If you haven't downloaded it and tried it out, do so. It's lightning fast and stocked with a plethora of add-ons (many of which have, in fact, been updated to work on Firefox 3, and not merely Firefox 2).