Off topic I know, but I just found this little tid-bit since this jogged my memory and got me thinking.
Quote:
Hill Holder Clutch: A Subaru exclusive (originally a Studebaker exclusive...). Manual transmission models only. A small rear brake that, after being set by the brake pedal, when the clutch was still depressed the car car would simply not roll down a hill! A very popular feature. On all manual trans. Legacy Ls in the 1990s and many earlier models. There is no hill-holder available with any 2.5L engine (1996 was the first year for the 2.5L) and it was discontinued for the 2000 model. Note: April 2002: hill-holder will be used again on the 03 Forester. This will be the first use in any 2.5L engine.
Source: http://www.cars101.com/subaru_terms.html 
