A prior version of this hack, Google Scraper, produced a list of comma-separated values. This version instead outputs an HTML table.

This output can be directly pasted into MS-Excel:
  select the contents of the popup window for copying (ctrl-A,ctrl-C),
  right-click on the target worksheet cell,
  select "Paste special -> HTML".
That's all there is to it.

To implement this hack in your browser, drag this link to your browser toolbar: gglTbl
The bookmarklet consists of the following JavaScript code:

javascript:
t = '</td><td nowrap>';
z = document.getElementsByTagName('p');
s = location.href.match(/start=(\d+)/)?RegExp.$1:0;
x = '<table>';
for (y = 0; y < z.length; y++)
	if(z[y].className == 'g') {
		m = z[y].innerHTML.match(/<a .*?<\/a>/igm);
		for(w = 0; w < m.length; w++)
			if(!!(v = m[w].match(/href="?([^ ">]+)[^>]*>(.+?)<\/a>/i)))
				x += '<tr><td>' + s + t + v[2].replace(/<br>/ig,' ').replace(/<[^>]+./g,'')
				+ t + (/^\//.test(v[1])?'http://'+location.host:'')+v[1]+'</td></tr>';
		s++;
	}
with((window.open('')).document) {
	write(x, '</table>');
	close();
}

Sample output:

Requirements: JavaScript supporting level 1 DOM (Gecko, IE5+)
Verified in IE6.0 (6.0.2800.1106;SP1) and NS7.0 (rv:1.0.1 Gecko/20020823).