I quit watching Elfen Lied on the third volume. I just never cared for it. I may eventually watch the last volume just to close it out, but I'm in no hurry.
Negima's a cute series, but the final arc of the anime was pretty surprising, perhaps even shocking. Of course, it ended as expected, but it certainly followed a strange course to get there. It was worth seeing through to the end.
I keep a fairly long list of stuff I'm currently watching, and I have a number that I'm still catching up on. I still haven't finished the second season of the Ghost in the Shell series, but I have every intention of starting over from the beginning and marathoning it. Air Gear's been fun so far, Hellsing Ultimate's first OVA (much closer to the manga this go-around) was AWESOME, Eureka Seven's been very enjoyable. Haruhi just came out, and it was a lot of fun. I've also been watching the older stuff, like You're Under Arrest and the new dub of Macross. Bleach has been good, and I liked Black Lagoon. Coyote Ragtime Show has been fun. Ultramaiden Valkyrie is pretty shitty, though...talk about a show lending itself to lolicon.
As for shows I recently finished up, Gun Sword was a lot better than I expected, and Mars Daybreak was much cooler than it gets credit for being. Hare+Guu's a hoot, but I haven't seen the Deluxe OVA yet (had to use a trial Blockbuster Online rental to get it...Netflix is starting to be a pain when it comes to new anime). My-Hime took a while to heat up, but when it did, it was pretty enjoyable. For a show that was the anniversary series for Gainax, This Ugly Yet Beautiful World was comparatively lackluster.