Kirk has seen downward movement due to the military record snafu. It's interesting that Giannoulias has not really benefited, but respondents are instead shifting to the Green candidate as a NOTA choice.
That's not the worst news in the world for Alexi considering how third party candidates' support tends to collapse late in the campaign, and while some of those current Greens will stay at home or (far fewer) vote for Kirk as the less corrupt evil, most will likely come home a vote Democratic. I realize Whitney's strong showing in the 06 governors race might initially indicate an aberration with IL Green candidates, but I don't think that that will replicate in a race that is both federal (i.e. more partisan than gubernatorial races) and likely to be much closer than Blago's widely expected reelection.