I've always wanted to see a full galaxy map showing the locations of the various humaoid species such as the Klingon homeworld, Romulus, Cardasia, and Ferenginar. Other information like where the Federation first encountered the Borg, the location of Omicron Theta, and the various territorial boundaries (Federation space, the neutral zone, etc) would be an added plus. I've seen all kinds of conceptual Star Trek stuff, especially this one poster that shows pretty much every ship and space station in Star Trek so that you can see how they all relate to one another in scale. It seems that there would be a canon galactic map that pinpoints the locations of as many Star Trek trivia points as possible. Does such a thing exist?
This map is one that was considered at least semi-canonical.
From "Star Charts" © Geoffrey Mandel.
Star Trek: Star Charts is a guide to the Star Trek universe – the stars and planets of the United Federation of Planets and the other powers of the Milky Way Galaxy. It includes background information on the classification systems used for identifying stars and planets.
I don't think either would qualify as canon, but there have been two published books of maps of the Star Trek universe that might at least be seen as semi-official: Star Trek Stellar Cartography, and the earlier Star Trek Star Charts (which is out of print and pricey to get used, though somewhat cheaper used copies can be found on the amazon.co.uk page). The Memory Alpha site has an article about Star Trek Star Charts here which mentions that people who worked on the show like Michael Okuda and Rick Sternbach were consulted:
Star Trek: Star Charts was written and illustrated by Geoffrey Mandel, with the help of Doug Drexler, Tim Earls, Larry Nemecek, and Christian Rühl (see below). André Bormanis, Michael Okuda, Rick Sternbach, and Timo Saloniemi gave technical advice.
There was also an older book called Star Trek Maps from 1980, but that obviously wouldn't include anything from later series like TNG.