It seems VUE is offering, for a limited time, a free second shot on Cisco exams:
Here's how to redeem your Cisco "Second Chance" Exam:
Register for an exam at full price. If you fail the exam, you may schedule a free retake of the same exam by entering the promotion code: SECONDCHANCE at the time of registration.
IMPORTANT NOTE: Both the full-price exam and free Second Chance retake must be scheduled and taken between April 15, 2008 and October 15, 2008, to qualify for this special promotion. Free exams may only be scheduled via the web.
Kudos to nicklauscombs over at networking-forum.com for bringing this up.