Didn't see any properly formatted SC threads, so here.
Samurai Champloo is basically a sword-based anime (chanbara) about 2 vagabonds who find themselves indebted to a waitress for helping them evade excecution and saving their lives. Now the three, Mugen, a rogue samurai who's fighting movements resemble that of a breakdancer, Jin, a shunned master swordsman of many arts, and Fuu, a 15 year old chick, are out to find a Samurai who smells like sunflowers so that Fuu can have closure.
I think this would fit perfectly as a rotation for Cowboy Beebop. Samurai Champloo is an excellent anime created by the same producer, and was aired on the same network as CB, Adult Swim. They're both 26 episodes and I think it'd help variate the stream so the same shows aren't aired all the time. It's almost like a hip-hop oriented Bebop that uses swords instead of guns, not to mention it uses music from the favorite producer, Nujabes. Both are excellent animes (though my preference will always be SC) and I think they'd make an excellent hour-block/rotation.