Anyone else remember piiq.com and it's related sites?

There used to be a whole series of sites, with the main one being piiq.com. The idea was you would put a topic between the "p" and the "q" in the URL and you'd find a landing page with links to various other sites on that topic. For example "pbooksq.com" had links to Amazon, Borders, and Barns & Noble; "pmusicq.com" had links to CDNow, Tower Records, etc.

I always thought it was an interesting concept, but seemed expensive having to own so many domains.