Martin Fowler's quote seems to be a riff on Weinberg's various folksy observations in The Psychology of Computer Programming -- though maybe Weinberg picked it up from elsewhere.

The Alan Kay quote is a possibly apocryphal story; there are varying accounts[1] (and see [2]).

No list of programming quotes is complete without the Epigrams of Alan Perlis[3].

[1] http://c2.com/cgi/wiki?HeInventedTheTerm [2] http://c2.com/cgi/wiki?HeDidntInventTheTerm [3] http://www.cs.yale.edu/quotes.html