That page you linked to explains the situation pretty well, Phoenix. It includes this...
We made Google aware of the issue in late November. They have redesigned the embedding mechanism to prevent our attack and are now distributing a version that is not vulnerable. The Google Desktop application has an auto-update feature, and Google is rolling the updates.
I've been using Yahoo's Desktop Search today....oh my God it's fantastic....blows MSN Desktop & Google Desktop searches out of the water, IMO. I always hated Google's forcing you to use a browser to search & their tiny results previews, & MSN doesn't rank things very well & is a bit slow (compared to the others, anyway). But Yahoo Desktop Search is incredibly powerful, lightning fast, has a great interface, & offers much more control than the others. B-e-a-utiful. One thing I noticed right away is that Outlook doesn't have to be open for it to index your email, which is a nice change from the others.
Of course, Yahoo did start out with an already complete, popular & award-winning application (X1, which I've been interested in for about a year now but never tried because it was a commercial product), while Google & MSN, as far as I
know anyway, mostly wrote theirs from the ground up.
I'm not familar with other similar products like Copernic and Ask Jeeves Desktop Search beta...