This week's book giveaway is in the Agile and other Processes forum. We're giving away four copies of The Mikado Method and have Ola Ellnestam and Daniel Brolund on-line! See this thread for details.
When something gets posted, it gets added to the index for searching. When something gets deleted, it does not get taken out. Every once in a while, I'll run a re-index utility that will re-initialize the index to be perfect, but that won't fix any deletes that happen after the re-index.