The UNIX-HATERS Handbook
For an extended meditation on the usability (or, more properly, the lack of usability) of UNIX, see The UNIX-HATERS Handbook. Don't get too carried away by the rhetoric -- note that the contributors include Simson Garfinkel and Dennis Ritchie, neither of whom is particularly anti-UNIX (Ritchie being one of the co-inventors of both UNIX and C). But it's fun to read.
Speaking of Donald Knuth...
NPR's Morning Edition ran an interview with him on Monday.