Speaking of words I like, I found the online dictionary Ninjawords in 2006 when I discovered Wordie, the social network for pedants and grammarians. Ninjawords has since become my favorite general-purpose online dictionary. (At school, I use the OED when I want to see some etymology.) Ninjawords is light on features, which itself is its greatest feature next to its speed. I personally like the lookup history, which makes it easy to see what words you’ve looked up recently. Great for, among other things, reinforcement when learning new words.

blather
(v) : to talk rapidly without making much sense
(n) : nonsensical or foolish talk

lather
(n) : the foam made by rapidly stirring soap and water
(v) : to cover with lather

I don’t know why, I just love the word blather.

(adj) : suitable to be eaten; edible
(n) : anything that can be eaten; food

I was absolutely convinced the word for this was combustible. Oh well.