Today is the day NASA's latest Mars probe Mars Reconnaissance Orbiter (MRO), is due to enter orbit around Mars. Assuming all goes to plan. Check back later for more news.
Update 16:50PM: I've just found the timings from the MRO 'orbit insertion' here. Things don't really start happening until later this evening, the earliest we'll know if all has gone to plan is 2216hrs. You can watch proceedings on NASA TV.