Advertising has it’s place online, but there is definitely benefit to blocking advertisements in your browser. Put simply, productivity can increase because digital distractions are decreased. This is of great use to the small business person.
There are plenty of adblockers out there, the most popular of which is AdBlockPlus.
If you don’t want to purchase an ad blocker and are a DIY type, you can edit the host file on your computer to block content from known advertisers.
Excellent instructions are kept up up to date and you can sign up to be alerted by email from MVPS Host News when a new version is posted.
More info @ http://winhelp2002.mvps.org/hosts.htm
Also, if you’re on a Mac, I suggest using TextWrangler.