Y'know, sometimes I'll like a word just because of the sound of it, or the spelling, or because of what it means, or because of everything about it, or because of a particular usage of it, say in the media or something. So many reasons to like words.... Anyway, I won't remember all my favorite words, so I'll just add them whenever they occur to me.

aesthetic
antidisestablishmentarianism (for its having been used by the series "Recess")
apotheosis (particularly for Sewer Urchin having used it in "The Tick" cartoon)
bizarre
chief
chaos / chaotic
coincidence
colloquial / colloquialism
copacetic
disambiguation (a popular word over at Wikipedia)
disseminate / dissemination
eccentric / eccentricity
eclectic
eldritch
electroencephalographic technologist (for its having been used in an old McDonalds commercial)
ellipsis
epiphany
ethereal
fjords (particularly for Slartibartfast's use of it in The Hitchhiker's Guide to the Galaxy)
genre
glockenspiel
hierarchy / hierarchal
hmmm...
homage
indubitably
karma
kismet
maelstrom
meander
melancholy
miscellaneous
non sequitur
objective & subjective
penultimate
presume (for it allows you to assume without making an ass of u and me)
proselytize (don't really care for the meaning, though)
quintessential
quirky
retroactive
rutabega (I am rutabega boy! for I have the memory of a particularly forgetful rutabega)
segue
serendipity / serendipitous
stream-of-consciousness
suh-weet!
surreal
vagaries
vague
vicariously
yoink!