Safari
Apple's web browser is now available for Windows XP and Vista. Safari had previously only been available on Macintosh operating systems. The browser is certainly quick and uses about as much memory as Mozilla Firefox; however, Safari takes up more hard drive space than Firefox: around 60Mb. Nevertheless, Safari is yet another alternative to Internet Explorer.
You can download Safari for Windows for free from here.
Firefox
There is also a new version of Firefox in the offing. At present it is still in Beta, which means that it is being tested by users and should not be considered to be finished software. According to Mozilla, Firefox 3 uses less memory than the old version - a particular complaint of mine.
You can download the Firefox 3 Beta 5 for free from here. (But be aware this is far from bug free software).