One of the ways in which OA materials can be reused is to incorporate them into open knowledge/ open education projects. For wikis, a few examples of OA reuse are given at http://species-id.net/wiki/User:Daniel_Mietchen/Talks/Open-Access-T....

For suggestions on further interaction between the OA and wiki communities, I posted an entry at http://www.openaccessweek.org/forum/topics/open-access-at-wikimedia .