Island Agent:
Most web hosts work the same, as far as making your website accessible over the web. Where they differ is in features and service.
Yahoo's small business option has some features you won't get from a normal web host, such as shopping cart technology. Of course, you'll pay more for the Yahoo plan.
If you need the extra features, the Yahoo plan might be for you. If you just need basic hosting, you could save money each month by using a basic host like GoDaddy.
Hope that helps. Good luck.
-Brandon