@Lynne

I guess you could reduce the width of the last column:
.threadbit .threadpostedin {max-width: 15%;}
(was 19.9%)

And the replies column:
.threadbit .threadstats {max-width: 10%}
(was 15%)

and then increase the threadinfo area:
.threadbit .threadinfo {width: 54%}
(was 45%)

You can see if those numbers work for you. You may need to make them specific to the search results page by adding something like div.searchresults in front of each of those.

Rawr, worked nicely. But I didn't get the part about div.searchresults. You add them in front of those .threadbits in search.css? It won't influence anything else that way? And does it influence something if it's not added?

You would add the in front of the CSS you added to the additonal.css template that I wrote. but, only if you need it and I have no idea if it is needed on your site.