well ACTUALLY, you're in luck because both Smallville and Supernatural are going on hiatus until the middle of January, so i'm sure you can catch up. but is there anything specific you want to know?? i can give you a few details if you want.......but if there's anything else lemme know......
Lana moved in with Lex and she is now pregnant(argh!). Jimmy Olsen is dating Chloe, and Oliver Queen(The Green Arrow) is with Lois(by the way, Oliver Queen=hottness!). Clark doesn't know about "the baby" yet, Lex JUST found out about it last episode. Martha and Lionel ALMOST kissed, but thankfully they didn't.
Supernatural: Dean and Sammy have now met Ellen, an old friend of John's, who has a daughter that is drooling all over Dean(in a not so attractive way). John died in the first episode. he made a deal with the Demon to bring Dean back(he was almost dead) and take his life, and the gun, instead. so it did. but the boys don't know that. before John died he told something to Dean about Sammy we don't know yet(i'm assuming it has something to do with why the Demon wants him and other's like him) so i'm guessing in tonight's episode, we will actually hear the answer.
that's all i can really think of right now. if you have any more questions, let me know. i might be able to find a site for you to watch the first 8 episodes of Supernatural.
but make SURE you watch tonight starting at 8 with Smallville, both shows are new tonight, but go on hiatus until January after tonight.
have fun!