Might not be news to everyone but I've been looking for this for Opera for a while now- thought I'd share 
http://www.tech-weekly.com/2007/04/browsing-tip-of-day-block-intellitxt.html
http://www.tech-weekly.com/2007/04/browsing-tip-of-day-block-intellitxt.html
Ever gone to a site that had those infernal double underlined words that no matter how hard you tried to not hover the mouse pointer over still managed to pop up those annoying IntelliTXT windows with basically useless information? Well I have been seeing them more and more often and I finally got sick and tired of dealing with them. Below you will find three quick fixes for IE7, Opera and Firefox. Sorry I have not found one for Safari yet if you know of one please drop the link in the comment section. Programmer Brian Donovan has written a Greasemonkey script called Uh Oh IntelliTXT to block IntelliTXT popup's for Firefox users. IntelliTXT can also be deactivated with the Adblock plus Firefox extension by using the string *Intellitxt* in your filter list. To block IntelliTXT popup's in Opera browser, simply add the URL http://*.*.intellitxt.com/* into Tools > Advanced > Blocked Content. To block IntelliTXT popup's in Internet Explorer 7, simply download and install IE7pro and add the string *intellitxt* to your Ad Filter list under the Block list. You can use the following code as a bookmark after the page has loaded to stop IntelliTXT: JavaScriptfunction(){found=1;cnt=0;while(found==1){found=0;t=document.body.getElements
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I take it that's a spyware blocker?