I think that rather than utilizing a mentor system, it would be much better to manage a Wiki specialized for the community. In this Wiki everyone could sign up and submit guides or tips they know and think the rest of the community could benefit from. Utilizing the embedded talk system in the Wiki, the community could discuss about changes in the Wiki documents and hold democratic conferences about the decision of the persons to moderate the Wiki. The work that moderators need to do is to verify that all submitted material is useful and actually related to Debian GNU/Linux. The reason why we would have a separate Wiki from the actual Debian Wiki is that in this separate Wiki the community is managing and contributing to it and therefore allowing for subjects to be submitted that are not in the Debian Wiki. The Debian Wiki concentrates more on Debian GNU/Linux itself by providing useful information on installing and debugging a Debian GNU/Linux system from the ground up to an X server. Because of this fashion I highly doubt it that there are going to be guides in the Debian Wiki on how to compile the latest Wine or setup ALSA with software mixing for example.
What do you think about my idea? Of course the Wiki has to be well-organized and categorized in detail to allow new users, and especially users converting to Debian GNU/Linux from an another operating system, to find what they need. I am also thinking about a very useful feature to allow guests to contact the author of an article for further help. For example, if I had written an article about compiling Wine from source, but have not mentioned the possibility to compile it with support for DirectX 9, the guest could send a message to me asking for this. Then it will be my responsibility to either find the answer by myself, or talk about the issue in the Wiki talk to get help from other members of the Wiki. This way there will always be a connection between the user and the community. By estabilishing this kind of connection it will be much more convenient for the more experienced users to help the newer users, and when the newer users have gained enough skill they can sign up and help the rest of the community by themselves with the community.
To me it is a great thought, but should be considered at least twice as it will be much work to set up the Wiki in the first days. Regardless of the way you see my idea I agree that there should be more efficient solutions to help new users. "Google" and "RTFM" do not fit in the policy of helping each other. We can however make new users understand afterwards that there can be useful guides or tips on the internet easily found with the aid of Google. Note that the keyword is afterwards, do not say "RTFM" directly to a person who is asking a simple question, no matter how dumb the question might seem to you.