Yes, this is happening to me also. It is actually part of the AJAX SERPs as well.
I have more details on this where Tedster knows where to find it. But here is some of that content:
I'll do a random search, lets say for:
Then I will enter in a new search term and the URL will keep the original q=driver+run, but add more parameters.
This got to be the AJAX SERPs that blew up a year ago and that Google promised would come back again.
notice the num=30 also, that is why I see 30 results.