[yummyfajitas]

Spam email autoreplier. I built a toy version in lamson which gave credible (to me) responses - "Yes, I am very interested in earning $1 MILLION ($1,000,000) dollars from your dead Nigerian uncle." I went into my gmail spam folder to look for a training corpus, and found that the Nigerians have given up.

Eigenshare - online document sharing for latex-using scientists. Basically, built in document sharing, version control, etc. Couldn't get anyone to use it.

Timeserieszen - scrape a lot of timeseries data from various government agencies, and make a nice display for it (answers questions: "how have annual working hours evolved since 1960"). Never really followed through on it.

Quite a few more.