The semester has come to an end, now what do you do with that paper you received excellent feedback on?  You may want to consider submitting it to an undergraduate journal for publication.  If your paper is published, it will look great on graduate school applications and in personal statements.  A number of undergraduate journals exist for various disciplines including art and literature, business, philosophy, and political science.  One list of undergraduate journals and conferences can be found at the Undergraduate Journals and Conferences Directory.

The first step is choosing what you will submit.  You should choose a paper that received a lot of positive feedback from a professor.  The second step is choosing a journal.  Make sure you familiarize yourself with the journal's submission guidelines.  Next, you will want to contact the professor and ask him if he has the time to provide you with comments on your paper - you are planning to submit it to an undergraduate journal.  Even if you received a positive response when you turned your paper in, you may find that this time around your professor makes a lot of comments.  Do not become discouraged, this is a good sign.  You will go through these comments and edit your paper as needs be.  Once you have done this, you may want to have someone proofread your paper for you for grammar errors and typos. Once the paper is in final, submittable form, send it out and wait. 

Good Luck!