I came across the blog of Ben Buchanan who has blogged about Opera frequently. Here are two great links from his blog:

• Adding opera buttons for dragonfly and cache reload

  Buttons to add to standard toolbars rather than access these functionalities through deeply buried menu items - provided you use those toolbars (I dont!)

• ie8 not defaulting to ie8 rendering after all

  This has a great overview of the renewed uproar over IE8 Beta release that goes back on the promise of rendering IE8 as IE8 by default (it now renders as IE 7 for intranets and puts a “broken page” icon for standards mode rendering).