is where it all began, and yesterday the prodigal reality-hopping hybrid surreal SF RPG expanded to include a monster supplement I call "Golden Age Adventures". It's an anthology of 16 roleplaying adventures based on stories by well-known science fiction writers of the 1930s-50s.
My approach in this book has been to break down the source stories into what I call "PlotFields" - basically taking an "object-oriented" approach to the construction of settings complete with monsters, obstacles, maguffins and narrative drives - but without forcing any particular arrangement such as a "plot". (The full text of each source story is also included, so you are free to follow the original plot if you want to, but that's up to you.)
Because these PlotFields are so constructed, they may be used as source material for any type of game that requires alien worlds and narrative components. The DayTrippers system is deliberately simple, and conversion tables are included in the books for other popular game systems. (Not just systems, but whole approaches: the DayTrippers Core Rules book includes a set of "Collaborative Mission" rules which crosses the line between Tradgames and Storygames.)
I'll be using this thread to drop off news and answer any questions anyone might have, and explain some of the techniques I use in the book.