Polls closed just closed (9:00 p.m. eastern), and the AP will be posting unofficial results here. Democrats need to win three of the six seats to take over the state senate. I'll be updating this post as results start rolling in.
Update (10:12 p.m.): It looks like Republicans Sheila Harsdorf and Robert Cowles will win. With 66% of precincts reporting in Cowles's district, he's leading with 59% of the voting. And with more than 50% of precincts reporting in Harsdorf's district, she's getting 58% of the vote, well outpacing George W. Bush's 2004 margins county-by-county when he won with 51%.
Luther Olsen, the "linchpin" of the recalls, is at 55% with 70% of precincts reporting. If he can hold on--as outstanding Democratic precincts come in--Republicans will likely hold the senate.
Update (10:38 p.m.): WisPolitics has called it for Olsen. All eyes are now on Republican Alberta Darling, who was polling better than Olsen heading into today, but won with just 50.5% of the vote in 2008.