Check
http://www.spaceweather.com
They have a list of PHA's (potentially hazardous asteroids) about 2/3 down the front page.
Click on 1998 SF36, which on June 26th will be five lunar distances from earth. This is a pretty big rock and will pass very close to us (astronomically speaking). I think people may be speculating that there are clouds of smaller debris surrounding these big rocks, so we may get hit by smaller rocks even though we don't get broadsided by the bigger one.
That's the closest of anything I know of until sometime in September. Then there is a very strange asteroid that will actually ride along beside us for a while, kind of like 2 horses in a race.
I think we are in the clear on the comets. It looks like LINEAR has already passed beyond earth.
I think LINEAR came from the south and was only visible in the southern hemisphere.