i'm with dim
yeah, i really don't see why the blade could or should be curved. what difference does it make? it's a lightsaber. it can cut through (almost) anything. i imagine that palpatine probably has one, and along with that thought, he probably hasn't used it in combat for decades (training with Maul???).
as long as we're talking about light weapons, how about
light ninja stars? you throw this little disk and then use the force to ignite it while in flight.
light arrows that you shoot from a crossbow? goes right through all of those clones!
light dagger? for when you lose your saber and need to kill the now approaching, over-confident bad guy.
light brass nuckles? ow, that hurt.
light nun-chucks (spelling)? okay, this one is a little stupid, up there with the curved blade.
i wouldn't be suprised if the only "weapon" we see palpatine with is his funky blue bolts of nastyness.