The newly created WEG Wiki features an interesting article about the history of West End Games. Here’s an excerpt for your convenience:
Previously a producer of board wargames, the company began producing roleplaying games in 1984 with Paranoia. The high production values demanded by the wargames industry made them one of the few companies who could compete with TSR, and they were able to acquire the license from Columbia Pictures to produce an RPG based on the film Ghostbusters. This game, Ghostbusters: A Frightfully Cheerful Roleplaying Game, formed the basis of the D6 System which was to be heavily used in many of their licensed products.
The wiki still needs a lot of work (the only pages currently available are the aforementioned article and a homepage), but such a wiki could be a great asset to the WEG fan community in the future!