Zee wrote...
-Afro Samurai American anime with the help of some of the peeps who made Cowboy Bebop.. Its pretty crazy.. lots of good gore.
-Claymore (Pretty good, this one i know the manga goes farther after the anime's ending)
-Blood Ova
-Blood +
-Samurai 7
-Samurai Girl Real Bout High School (kinda low budget anime.. awesome manga tho)
-Samurai Champloo (great animation, packed with sword fighting made by the peeps that did Cowboy Bebop also)
-Seirei no Moribito(main character has a spear but she fights off alot of swordsman.. Great story with great animation)
-Tales of ___ (all the "tales of" animation that are series and ovas based off the orginal games have swordplay in it.
-Utawarerumono (great story..the progression of this anime is weird.. like its slow paced and easy going at some points while the successions of battles goes quickly.
Theres more.. I may post them if They come to mind later
I agree with Afro Samurai, it has some great sword fights. Seirei no Moribito, is so far an awesome anime that has some really fluid fights. The other anime that have been mentioned has some great sword fight scenes.