Shiv Sing posted an article on Line56.com regarding the Intranet Trends to Watch. Many of the trends Shiv lists are not surprising. Like for example, the corporate telephone directory is not the killer app on the intranet.
However, sadly with all the emphasis over the years on knowledge management, the recent hype around personal search tools and of course the web search power houses, Information Retrieval is still an unsolved problem on the intranet.