A few things you should consider:
-Expect the cop to show up. Officers are on the clock when they make court appearances, many of them being paid overtime. This is actually an incentive for them to show up for court
-The speed registering devices are not as accurate as anyone would have you believe. The faster you are going, the MORE inaccurate the devices are (yes, this includes radar guns)
-Radar guns have to be calibrated every so often (I forget the exact amount of time) or they become very inaccurate. If the radar gun was not calibrated in this amount of time, the radar data is deemed inaccurate. You should request calibration records
-Officers have to be trained a certain number of hours on any equipment used. Request training history.
-You have a right in traffic court to never be called and asked to testify
-You also have a right to call the ticketing officer and cross examine him/her as to the circumstances of the day (start out with reviewing what happened, what the weather was, where the cop was positioned, what type of car you were in, etc. If the cop cannot remember, request the case be thrown out of court)
-You should also obtain copies of the local law on speeding. Break down the wording and figure out if you actually broke every portion of the law as written (you never know)
You should not just accept that you are guilty and pay the ticket. If you are going to fight the ticket, you should not go in stating you were not speeding. Offer technical discussions as to where the cop may have made a mistake (radar gun not calibrate, data was inaccurate, sun was in cops' eyes, something like that).