As a little self-constructed ritual, I watch this movie every year on February 2. It gets better every year.
Last year, Jonah Goldberg wrote a paean to Groundhog Day in National Review; you can read the first part here. A very religious interpretation of the movie is here. A nice essay by Alex Kuczynski at the NYT is here.
Check 'em out; and if you haven't seen the movie, check it out.