As @brendansullivan07 suggested in a comment, we should perhaps provide a list of the best material our site has thus far. Of course, one could simply order the questions with respect to votes, but maybe there are others that have been lost in the mix.
I suggest we "nominate" questions that accurately portray the scope of our site, which could be used for demonstrative purposes when introducing MESE to a new user.
Note: These questions should not only be good, but should also have high-quality answers.
Edit (4/7/14): About two weeks have elapsed since this was last updated, so perhaps there are new questions or answers worth posting/linking to from the past half-month.