What types of cables or interconnects do you recommend?
PSB Speakers does not endorse any particular brand of cables. We usually use 14-gauge wire when testing speakers. Wire does affect sound and the best way to test this is to find an audio/video dealer who specializes in wire and ask for samples of different brands. We do recommend the following gauge of standard two-conductor wire for wiring distances:
Less than 25': 18 gauge
25-50': 16 gauge
50-100': 14 gauge
over 100': 12 gauge
If you prefer, you can use heavier (lower gauge) wire.

Zimm, always good to hear facts. But as you are well aware, Krypton impregnated wire supporters never let the facts get in the way of a successful marketing campaign!

You know that they're not to replace diapers, right?

Well, PSB does not, to my knowledge, make or sell speaker wire. Nor do they recommend a company or type of wire. They say bi-wiring won't help, and speaker break-in is a myth. So if it is a marketing campaign somebody should get their money back. They aint sellen it too well.