I have to say Google instant could give you both positive and negative. It is depend on how well your website ranked for related longer tails keyword. If your website performing well for relative keywords then the increase could be possible since the instant will display results prior finish the keyword typing.
Google Instant seems a little irritating to use, and I find the results are not exact as you would in a normal search, so I suspect they are still ironing out the bugs
I've targeted some short keywords but the bulk of the new referrals are coming from "longtail" keywords. Thing is I don't check my rankings that much on google. I just focus on content. I've had my site up for a couple of years now and haven't done any link building since last year. I've never targeted keywords. I just focus on content. Maybe you're right, but most of the new referrals are coming from google. Maybe. I'll update this thread in a month to let you know how the traffic is faring.
I have seen decrease in my site traffic from US and UK.... It may be affect of Google instant launch.... As my site ranking position is same in top 5....
It was just minor update my site was updated from na to pr 0, i have also seen many people saying that it is minor update!