httperf is a cool load testing tool. You can use the --wlog option to pass in a list of URIs for httperf to use but for some weird reason these need to be separated by ASCII NULL characters.
You can do this by creating a newline separated list of URIs and then:
tr "\n" "\0" < infile > outfile
From: http://www.hpl.hp.com/hosted/linux/mail-archives/httperf/2004-November/000179.html