Thanks for the feedback. Noted on points one and two. Re: 3 - I'm not sure what you mean. No, we don't do rollover popups. 4 - will run some A/B tests.
re 3: what I meant was "do your links disrupt the user experience unexpectedly?". I'm sure you've seen sites where you rollover a word with a double green underline (often keywords sniffed from search engine Referer headers) and some annoying ad popup appears, convering the content. That sort of stuff.