When a user enters a search term or clicks on one of the help topics a list of related community rated/approved articles could appear along side it, with something clearly stating that it unofficial support.
The thumbs up/down are there to rate the usefulness of that suggestion in relation to the search.
In the case that someone searches for something more specific to Ubuntu the results could come from a community suggested set of Ubuntu related links e.g. ubuntuforum.org, www.workswithu.com etc. The ratings system and overall maturity of search algorithms could be used to filter out spam and unrelated results.
Overall I feel this could help people find answers to their questions a lot easier and empower the community more