It's also incredibly annoying. I don't mind ads and I'm fine with plastering them all around the site, but for the love of Pete, why do they still use the pop-up ads? Argh! Every time I look up a word, I get another window bouncing onto my screen advertising this or that. Stop it! Go away! It makes looking up a word take twice as long.
If you've got a dictionary resource that doesn't do this, please let me know.