This little bit of javascript will allow you to clear all google related
cookies when you are on the google search page. A good idea to do this once
in a while so they can't link all your searches (though they can probably
do so anyway by IP and habits, etc :( Better than nothing.
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Drag this link up to your toolbar and click it while on google search:<br><br>
<a href="javascript:x='Nothing';y='preferences';try{if(confirm('OK: Zero it\n\nCancel: Do_'+x+'_(e.g._already_zeroes?)\n\n'+unescape(document.cookie.replace(/;/g,'\n'))))h=location.host.match(/\.google\.((off|com?)(\...)|..|com)$/)[0];document.cookie='PREF=ID=0000000000000000:LD=en:TM=1115409441:LM=1129104254:S=kSuablMgN8pP9-91;expires=Sun, 17-Jan-2038 19:14:07 GMT;domain='+h;location='/'+y+'';alert('Zeroed:\n\nNow_reset_your\n'+y+'\n\n')}catch(e){alert(x+'_done\n\n(e.g._not_Google?)\n\n')}void(0)">GoogleAnon</a>
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I cant take credit for this, no idea where I found it a year ago ish. -math
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The JS is (view source to see it if you want):<br>

<table width=100% border=0>
<tr><td>

<font size=-1>
javascript:x='Nothing';y='preferences';try{if(confirm('OK: Zero it\n\nCancel: Do_'+x+'_(e.g._already_zeroes?)\n\n'+unescape(document.cookie.replace(/;/g,'\n'))))h=location.host.match(/\.google\.((off|com?)(\...)|..|com)$/)[0]; document.cookie='PREF=ID=0000000000000000:LD=en:TM=1115409441:LM=1129104254:S=kSuablMgN8pP9-91;expires=Sun, 17-Jan-2038 19:14:07 GMT; domain='+h;location='/'+y+'';alert('Zeroed:\n\nNow_reset_your\n'+y+'\n\n')}catch(e){alert(x+'_done\n\n(e.g._not_Google?)\n\n')}void(0)
</td><td></td></tr></table>