I've published a selection of over a thousand quotations that I have collected over the years, from the pre-Internet era to yesterday (I keep adding to the collection).
Accessing the Quotes
I used to have a nifty quote-of-the-day widget, and an iPhone app, and sub-pages here sorted by category, and all sorts of cool stuff. It all was powered by DabbleDB, which got acquired and killed. Oops.
This will give you an idea of the topics:
Until I rebuild it in something else, here’s the raw list as a Google Doc. Sorry about the length.