Answer: They're forms of poems.
Everyone who answered got it right except mythosx, who unfortunately said "prose". So that's EricBess, Limited, Melkor, Mooseman, Oversoul, Ransac, rokapoke, sageridder, TomB, and train. EricBess getting closer to the win...
Scores:
EricBess: 24
train: 23
sageridder: 22
TomB: 22
Melkor: 21
Oversoul: 20
Ransac: 20
rokapoke: 20
DarthFerret: 19
Mooseman: 17
turgy22: 14
mythosx: 13
Limited: 10
Lythand: 6
cardboardbox: 0