Are there any services available where you can sell domains via your site. I'm not looking for profit- just as a service to customers. It would have to be a proper package, with the facilities for searching for available domains, paying, and processing orders included. Alternatively, is it possible to register (and pay for) domains on behalf of other people?
Hmm well you could be a domain reseller. If you google "domain reseller" you will find a good bit of companys that allow you to do this.