Classically, Paranoia has been known as the suspicion that there is a conspiracy brewing which is out to do one harm. It has even become classified as a psychotic disorder.
In the United States of America during the 1960's and 70's, Pronoia was coined and became known as the sneaking suspicion that the Universe is conspiring on one's behalf.
In his 1972 book The Natural Mind, Andrew Weil makes note of "Positive Paranoia" - the ideology held by those who psychologically tested as having a "W" or Whole personality type. These people were shown on tests to be mentally abnormal. In practice however, these were some of the most highly functioning individuals in the community.
In the 1990's, a European "Zippy" group appended the definition of pronoia to include that Pronoia is the sneaking suspicion that others are conspiring to help you; and you them.
Today, in 2008, I offer Prenoia to this tradition of memes to be defined as "The joyful suspicion that it is one's duty to 'conspire' for the success of oneself; for the success of all other terrestrial beings, and the whole Universe."/Multiverse.