Contrary to many predictions and concerns, according to Comscore's new data, Google gained search share in September. So it looks like Instant Search is at least not a problem for many people. Also the Bing/Yahoo partnership has not, so far at least, helped Microsoft make further inroads into Google's share.
Google: 66.1% (up 0.7 from 65.4%)
Yahoo: 16.7% (down 0.7 from 17.4%
Bing: 11.2% (up 0.1 from 11.1%)
Ask: 3.7% (up 0.1 from 3.8%)
AOL: 2.3% (no change)