Ouch!! What you have there is a light starved over watered Aloe vera plant. Plant in cactus mix, similar to Jade Plant and water sparingly, about every 3 wks to once a month. Slowly introduce it to light until it gets full sun. Likes to be hot and dry. If you like, you can cut it into sections and propagate it. Just let the cuttings air out and callus for a day or so and plant. You may want to get it a little healthier first, though.

It looks like a yucca. Here is a link that might be useful: yucca

HA! That's pretty funny, mnktx. I went to a concert last night and ever since, "76 trombones in the big parade" has played in my head OVER and OVER, so they did it for you in advance. :-) If you're really interested in stuff like that (wasp eggs on caterpillars), you can follow the link below. Some folks at North Carolina State University's department of Entomology developed "a freaky tag-team of bugs" to eat kudzu, the vine that ate the South. Where I used to live, I watched a car parked at a garage get covered in kudzu in a matter of a couple weeks--it's beautiful, but it's the most aggressive plant I've ever seen. They didn't want the caterpillar to go nuts eating everything else, though, so they infected their caterpillars with an organic time bomb--wasp larvae in their backs which would eat them from the inside out. Poor caterpillars! Here is a link that might be useful: Freakish Bug Tag Team Article

Way too much advice is being offered here. Make sure your Peace Lily is within several feet of a bright window, but away from direct rays of the sun. Do NOT disturb the roots. Watch carefully and water it just as the leaves start to wilt just a bit. It is okay for it to sit in a bit of water for a day or so. A little observation will soon tell you about how often it need water before it wilts. ~Will