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It’s even faster than version 6.05 and has a few neat new features like a navigation bar that utilizes the relative links that are embedded in some HTML (ex. documentation). This gives you handy next, previous, up, search, index, table of contents and other buttons. [According to tb, Mozilla has this too but it is disabled by default for some reason.]
The main reason I use Opera is for the standards-compliance which makes it a great tool for authoring. Generally, if you design HTML to look good in Opera it will work the same in IE, Mozilla, or Netscape too.
If you’ve never used Opera version 6.0 or later, do yourself a favor and give it a try.