After a weekend of intensive coding, Pop, Look & Listen now has web forums. They're still in beta, and may not be quite perfect, which is why they're not actually linked from the main site yet. You can access them at /vox/.
A few points:
Pop, Look & Listen uses the Markdown markup system. (HTML would have been too messy and fiddly, and BBCode is just ugly.) This is used in forums, private messages, user profiles and other content. I will put help on Markdown on the site shortly; until then, please consult the Wikipedia page.
The blank space to the left of your comments/the comment box is space for your user icon/avatar. To upload one, go to the control panel.
If you notice anything amiss, or have any feedback, suggestions, &c., please let me know, either by http://www.poplookandlisten.co.uk/messages or by emailing andrew at poplookandlisten dot co dot uk.
Cheers, Andrew