http://www.surfthechannel.com/show/194.html" target="_blank SurfTheChannel is a pretty awesome source site. They link to episodes/movies on other free sites. No surveys or signing up required. It's a pretty awesome site.
And Hulu seems to have episode 10, but no other full ones.
http://www.hulu.com/videos/search?query=smallville" target="_blank Hulu is high quality, and legal (if you're worried about that). The one downside (the only one!) is that they have very short ad breaks. It's completely worth it, in my opinion though. Three 20 second (if that) ads for half an hour of high quality, recent stuff? Awesome.
Both are free without any signing up or anything, like I said already.