A few I made up, but they were for UK ATPL's so don't know if they apply. I have a card index of hundreds of them, but the ones below are ones I still use for instructing:
1. Factor's affecting induced drag:
*Smelly girls wash their arses lightly*
Speed, ground effect, aspect ratio, washout, aspect ratio, lightness (well weight really!)
2. Errors of NDB (when you do your assymetric NDB approach you'll see how well the nmemonic applies):
* Can't spell it out but read down the first line *
Coastal refraction
Undulating terrain
Night effect
Thunderstorms
Static
3. Order of priority in flight:
* BiG TAF *
Balloons, Gliders, Towing aircraft, Airships, Flying machines
4. Documents to be carried on international flights
* CRAP JAR *
Cargo manifest, registration cert, airworthiness cert, pax names, journey log books, aircrew licences, radio licence
5. Equipment to have on an aircraft
* FISH & CHIPs *
Fuses, 1st aid kit, seat (for every pax), harness (for every pax), chart, hand-held fire extinguisher, interception procedures, POH
6. Relationship between density, pressure, water vapour and temperature
* Dense pilots won't turn back *
See-saw with density and pressure on one side and water vapour and temperature on other, eg if pressure goes down, density goes down; if temperature goes up, pressure goes down
7. Factors affecting lift
* CAA's VD Willy *
Camber, Angle of Attack, Velocity, Density, Wing size
8. Factors affecting stall
* WALT FLIC *
Weight, angle of bank, load factor, thrust, flap, ice, C of G