I'm planning a short two-person (one PC, one GM) free-form session. Is there a good quality compilation of adventure outlines tuned for one-on-one play somewhere? The theme doesn't matter much, but I'd like some ideas fit for just one PC to get started.
It's not geared specifically towards two players, but The Big List of RPG Plots is my first stop in similar situations. Any Old Port in the Storm, Don't Eat the Purple Ones, Recent Ruins, and Stalag 23 would all be fairly easy to set up, and well-suited for a single player to handle.
One of the best genres as a whole for this is Espionage and Spys... Steal liberally from every James Bond movie and book. And any other such story.
Another good one, surprisingly, is the "Rebel Scout" in both the Star Wars and US Civil War settings. The prominent NPC in both has to do with the PC's mode of transport... in SW, it's the astromech droid; in the USCW, one's horse. Sneaking into systems/towns, finding out if that loner there is friend or foe...
Related, but suitable for guest PC's as well, is the investigation based scenario. It works best when the character has a mission-based reason. But it allows stealing from just about 30-some odd TV shows.
Which leads to another resource or two for ideas:
IMDB has plot synopses for many series' episodes. Steal liberally. Pick any series with a singular main character and rip away.