The application manager has a place to select a web address for the application catalogue.

Application manager:tools:Application catalogue

selecting new gives the following options
web address
distribution (currently set to mistral)
components (currently set to user)
enabled (a checkbox)

Do we know any addresses for this?

Update:
On the maemo.org 2006 site http://maemo.org/maemowiki/ApplicationCatalog2006 FBreader gives a valid address
http://only.mawhrin.net/fbreader/maemo
keep the other values as their defaults.
it worked like a charm. remember to install both packages.

As more sites become available post them here.