In depth: Never before has the once humble browser been so powerful. These days it's not just basic tasks that can be undertaken without leaving the confines of a Firefox or Konqueror window; some of the jobs that used to require complex desktop applications - database design, video editing, photo manipulation - are now perfectly viable for those with just browser software and web access.
There are other more proprietary and equally widespread technologies around, but as these in-browser application frameworks rely on plugins to work correctly, it could be seen as a little unfair to judge them in this Roundup. However, we're concerned with getting things done, so if a favourite site works better in one browser than another - even as result of better support from a developer - then we'll take it into account.
Think of it this way: we could offer a picture of how well each browser does on the Acid 2 test, chuck in a table of features and have done with it. But that would be lazy, because browsers rely on content from other sources and you need to know what really works best for you.