The CW is pretty happy with providing frustrated teenage girls with footage of washboard abs and cute dimples, while at the same time pretending to actual care about good science fiction/supernatural television shows. It's paid off for them so far... why not keep a good thing going?
Supernatural will get a 4th season which I suppose is good news for Supernatural fans. I don't watch it but I do plan on starting it some day so when I do, I got plenty of material for a Supernatural marathon. I've always felt that a tv show needs at least 5 seasons to grow up, find it's audience and tell whatever story it wants to tell. After those 5 seasons an inevitable drop in quality will occur unless we change the writing teams. But I'm happy Supernatural will get a chance to grow up, given that I know it's a pretty fun show.
Now on to Smallville... Gah. This show has been on a downward spiral ever since the 4th season. It is a crappy crappy crappy show, compared to what it used to be and what it could be. I hoped and prayed that they'd stop with 7 but obviously they think Tom Welling can pull off that 20something look a little while longer. Talk about suspension of disbelief. Given that Michael Rosenbaum will leave this season, maybe the only saving grace for season 8 is that Brainiac (portrayed by James Marsters) will become a major villain (if he's not killed by the end of THIS season). But then again an 8 season means more Clana.