On one of my sites, I've seen about a 25 percent increase from Aug. to Sept. During September, stats have increased throughout the month. There is a slight drop on Fridays (which is the way it has always been) but by Sunday, there are more visits than any other day of the week. Traditionally Sunday is as slow as or slower than Saturday, though.
One word search terms are way up. For example, in April, one word had 227 searches. So far this month, that word has 1,314 searches. This is an image site and all of the terms that are up are visual. Two-word terms and longer are very consistent with April's figures.
Google Images has doubled its referrals, including the other countries' Google Images referrals. Google's main index referrals are down; they are 1/3 of what they were in April. (While the site is seeing a 25 percent increase from Aug. to Sept., there has been, overall, a four-fold increase in site visits since April.)
I haven't seen anything good come from the traffic yet. This is a niche in which the action words/verbs are more important than the nouns. For example, it is something like a photographer's site, in which it would be better to rank well in the main index under "automobile photographer" than to get traffic from image searches on the word "corvette". Earlier this year, one of the pages was on the 4th page of google results on the site's main action word. Now it has disappeared from the results as far as I can tell.