Ah, I see that the concept of lurking evokes quite a bit of thought and reaction. And I'd like to add that the group of people who sat around the table at lunch today, on a beautiful summer day on the U of T campus had many of the same thoughts and ideas: eves-dropping, watching, listening, hanging about...some words with negative connotations, some with positive.
According to Wikipedia the term was first used in the 1980s with the first attempts at online exchange -- bulletin boards, email lists etc. It seems that we are stuck with the word, but through our discussion here, perhaps we can influence, just a tiny little bit, what lurking connotes in our own online community. Let's see...