Punching more holes in the semi-permeable membrane, along the road to the singularity, Second Life has Contextual Advertising.
“A ContextAds board listens to the conversations of those avatars around it, displaying advertisements when certain keywords are mentioned. Advertisers can bid on keywords, with their account only being charged when their ads are actually shown. Avatars can click on advertisements of interest to them, and can be offered a website, or a teleport to an in-world location.”
[contextads via adverlab via twitter of jj]