I have mixed feelings about this. I don't think the manga is over yet, so this would most likely be a filler filled trash heap.
http://www.animenewsnetwork.com/news/2008-03-23/blade-of-the-immortal-tv-anime-confirmed-for-summer
http://www.animenewsnetwork.com/news/2008-03-23/blade-of-the-immortal-tv-anime-confirmed-for-summer