If you use a major desktop web browser, you usually have to hunt down an ad blocking add-on if you're determined to purge intrusive promos from your internet experience. You won't have to go scrounging if you're an Opera fan, however: the company has released a developer version of its desktop browser with ad blocking built-in. It not only saves you the trouble of finding an extension, but takes the challenge out of it -- there's a simple on/off switch, and you'll get a mix of benchmarking and stats to show how effective the blocking is in real life.