Anakin's lightsaber attached to his belt. Sideshow produced some excellent stuff and the Jedi's utility belt is no exception. It has opening food and tool pouches with Aqua Breather, Comlink, food and energy capsules and has a leathery feel to it, not like the plastic moulded ones from Medicom (that's why medicom's Darth Maul has been dropped from many people's "want" list coz it's just not value for money and definitely not superior to Sideshow's version)
Anakin with lighted saber. Episode III is the only film in the entire series where two blue sabers are engaged in battle and Anakin/Obi-Wan's fight on Mustafar is jaw-dropping awesome where after cutting his legs and arm off, Obi-Wan leaves Anakin burning alive on the shores of a lava river, with Anakin spitting venomous sentiments at his departing mentor whilst Obi-Wan laments, "You were supposed to be The Chosen One"; so unlike the lame duel on Death Star in Episode IV when they crossed "swords" again.
Additional robotic arm included