I'm learning J. These scripts will follow my progress as I attempt to do useful things and generally stumble my way into learning the language. It's pretty fun so far.
Some highlights:
Working my way through the Python Challenges using "J when I can, Python when I must" (paraphrased Google motto). Don't look in here unless you want spoilers.
First calculates the great-circle distance between two latitude/longitude pairs, then the number of wavelengths within that distance of a particular FM radio station.
Calculates a monthly mortgage payment using the most common/popular formula, with some initial assumptions about term, interest rate, etc. Convenient while house-shopping.
A codegolf question, "A Skittish Program".