There are alot of dependencies that will weigh on your decision.
What were the weak parts of your test? Verbal or Quant?
If you've already completed your essays and other parts of your application and are committed to applying for the upcoming semester (I'm assuming Fall '07 at LBS), then I would lean towards sticking with the 610. You simply don't have much time before R3 deadline (~a month or so), and increasing your score substantially will take a solid effort and time commitment.
If your schedule is flexible, you haven't done alot of the essay work, and you are very concerned with getting a high GMAT score, you might consider postponing your app entirely, committing to a study plan for the GMAT, and applying for the Spring '08 semester.
If you listen to the folks on these boards, there are tons of extremely bright people here who spend months of intense studying to make it to the 650+ or 700+ level. Trying to reach that level in a hurry because of an impending deadline is just that much tougher.