Looking for a web browser like Apple's Safari that supports tabbed browsing but for Windows? I've done some research and highly recommend Avant Browser. It uses Internet Explorer's rendering engine so you get the same website compatibility but it adds tabbed browsing and a ton of additional features and yet it's free (donations accepted). "Tabbed browsing" is awesome: from a site's main page, when you click on links that interest you, those pages are loaded in separate layers "in the background" while you continue to go through the full page undisturbed. When you're ready to look at those linked pages, there's no backtracking and, best of all, no waiting because those pages are already loaded — just click on the tabbed layers.

UPDATE (2004-04-21): I now recommend Mozilla Firefox over Avant Browser. It also has tabbed browsing but pages load much faster. A colleague, Peter Smyth, introduced it to me.

TIP (2004-04-21): If you have used web page links or bookmarks/favorites that have a username and password embedded and use a non-standard port (non-working example: http://username:password@myserver.com:8080), you will have probably found out by now that they no longer work after recent Internet Explorer security updates have been applied. Solution I have found is to use the Opera browser — or a Mac!