Well using the Google Adwords traffic estimator( yes I know it's often way off ) 89.com can be expected to get 83 hits a day at the #1 posistion. So that about 2500 a month which is really probally half that. On the other hand a top adwords ad is less likely to get clicks than a top spot on the regular search results. And of course that's clicks and not everyone clicks an ad or search result. So who knows how many actual searches for 89.com there are. I'd estimate at least 25,000 - 100,000 a month on Google.
What puzzles me is why anyone would SEARCH for 89.com and not just type in
http://89.com ?