Click and drag from the link below on to your "bookmarks toolbar" or "links toolbar". When you click it from your toolbar, you will get the current "Today's Featured Article" page from the english Wikipedia.
   Wikipedia's Featured Article (don't click this link; drag-n-drop it)
The above link is usually called a bookmarklet.
Firefox/Mozilla users can also make the "Today's Featured Article" page your browser's home page by right-clicking the link above, then selecting "Copy Link Location". Then go throught the "Tools, Options" menu, go to the home page location field, then paste (ctrl-v).
Making the bookmarklet your home page will not work for Internet Explorer (and may not work in other browsers).
For browsers that don't support the bookmarklet as your home page (like IE), you can use this "Today's Featured Article" link as your home page. The title for the page is not quite as nice as the bookmarklet version, but you get the same content.
Updated Nov 13, 2007: The link was broken, but is now fixed. It should work correctly now.
Netjeff– Thanks so much for providing the bookmarklet and link. I found a helpful use for the link for those of us that read e-books and other content on our PDAs as described on:
http://www.mobileread.com/forums/showthread.php?t=6505
Thanks so much!
— Doug (remove underscores in address if you wish to email me.)