Last week the Grammar Guru poll result was
- I’m looking forward to seeing you = 4
- I’m looking forward to see you = 2
The majority got it right.The other choice is an error. This week’s poll is also about a typical error. For a good way to practice the correct phrase, see http://annehodgson.de/2008/10/28/im-looking-forward-to-hearing-from-you
But not all language issues the Grammar Guru will ask you to vote on will be errors. Stay tuned!