! Warning: this post hasn't been updated in over three years and so may contain out of date information.
Do Internet Explorer, FireFox, Opera and Safari all fail to meet your needs? Does the world need a fifth mainstream browser to fill some gaping browser functionality hole? It seems that Google feels the answer is “yes”, and so has developed a web browser from scratch
(UPDATE: apparently it’s based on the webkit core that powers Konquerer and Safari, so it’s not from scratch).
You can read all about it on the Google Blog.
UPDATE – It is now available for download from http://www.google.com/chrome. Please note that it is a beta download for Windows XP/ Vista at this stage (sorry for not mentioning the OS restriction before)
Here’s a sneak screen-shot for those without Windows (courtesy of Google Blogoscoped). It looks even better on Vista as they’ve used the Aero Glass effect well: