OK - so, the maemo.nokia.com repositories are the ones that contain the library objects and other 'dependencies' that allow the software to work when downloaded from Ovi and Maemo's own repositories.

Following a quick check with a web search, ope-service0 appears to be "Ovi Purchase Experience Library". I assume it's required in order to install software from store.ovi.com? It probably keeps a track of software installed so, for example, you wouldn't have to pay for the software again if you formatted your device - I think