The basic technique involved here is to be able to manipulate one of the variables handed to the Google search engine, a variable called sitesearch. Set it to a null value and you're searching the entire World Wide Web, but set it to a specific domain and it's constrained exactly as if you had typed in the Google special notation site:domain.
 
In addition to that, you need an input field and a submit button. Put them all together and here's the minimalist Google search form that lets the user alternate between just your site (well, in this case just my site) or the entire Web: 
<form method="get" action="http://www.google.com/search">
<input type="text"   name="q" size="31"
 maxlength="255" value="" />
<input type="submit" value="Google Search" />
<input type="radio"  name="sitesearch" value="" />
 The Web
<input type="radio"  name="sitesearch"
 value="askdavetaylor.com" checked /> Ask Dave Taylor<br />
</form>
There are some additional tweaks we can apply to make it a bit more fancy, including changing the radio buttons to a single check box, and aligning things a bit more nicely using a table and some simple CSS: 
<form method="get" action="http://www.google.com/search">
<div style="border:1px solid black;padding:4px;width:20em;">
<table border="0" cellpadding="0">
<tr><td>
<input type="text"   name="q" size="25"
 maxlength="255" value="" />
<input type="submit" value="Google Search" /></td></tr>
<tr><td align="center" style="font-size:75%">
<input type="checkbox"  name="sitesearch"
 value="askdavetaylor.com" checked /> only search Ask Dave Taylor
<br/>
</td></tr></table>
</div>
</form>
Here's how that renders when included on an HTML page:

only search Ask Dave Taylor
If you'd like to use this on your own site, simply change the occurrences of askdavetaylor.com as appropriate.
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