D. Hipp sent me his benchmarking code, so I ran it on my optimised Pg box. The optimizations are really just giving Pg some real memory to chew on. This box has 4G of ram, and Pg out of the box is optimized for a box with 8M of ram (no, really!). My config is here if you're interested.
One thing to note is that the tests use the sqlite (and psql) command line tool, whereas a better test for perl hackers would be one using DBI. But this thing is written in tcl, and I don't want to hack on it any longer than absolutely necessary!