Two pieces of Smallville news from Entertainment Weekly:
1) Allison Mack has opted not to return as a series lead for…
2) Smallville‘s tenth and final season.
EW’s Michael Ausiello reports that Mack will return “for several episodes next season to tie up Chloe’s Smallville legacy properly.” http://ausiellofiles.ew.com/2010/05/19/allison-mack-smallville/#more-8361
Earlier Ausiello had reported that Tom Welling was “faster than a speeding bullet–and The CW’s PR department–in blabbing to the press two days before the network’s upfront presentation that season 10 would, indeed, be the last one.

Chloe, I'm going on a Red Kryptonite-fueled rampage if I don't fly before the show ends.

Say it ain't so, Clark!
About Thom
As a tyke, his older sisters terrorized him with episodes of Dark Shadows and classic Star Trek until he thwarted their plans by learning to read the TV Guide. (He neither confirms nor denies nightmares featuring Yarnok from season three’s “The Savage Curtain,” but to a four-year-old, a rock-like alien can be pretty damn scary.) After theoretically growing up, Thom followed the family tradition and joined the Navy where he spent several fun-filled summers patrolling the waters of the Persian Gulf. Yet while on active duty he still found time to nurture his true loves—comic books and science fiction. He consummated those relationships by writing his doctoral thesis on The Next Generation, then moving to LA where he has worked non-stop since. His secret identity is as a mild-mannered college professor. But at night… Well, you know the rest.