Web hosting
I hate it when I want more information about a business but when I do a google search, they don't even have a simple website. You would that that in this day and age, everyone would know that they need a website in order to have a successful business.
Small businesses can find shared web site hosting pretty cheap and most places will offer domain registration as well. If you're lucky, you'll get email hosting with spam filters and virus protection too. Concentric even offers a blog and a wiki-dictionary with their hosting plans.
There really isn't a reason NOT to have a website. Especially if you are looking to reach as many customers as possible. Even the smallest business could benefit from a good website.
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