Reprepro suits my needs. I find this covers the basics of configuring it.

These are the contents of extras.install which adds the repository:

[catalogues]
catalogues = extras

[extras]
name = maemo Extras
uri = http://repository.maemo.org/extras/
components = free non-free

And omweather.install for a package:

[install]
catalogues = extras
package = omweather

[extras]
name = Extras
uri = http://repository.maemo.org/extras/
dist = fremantle
components = free non-free