Involve the User Community Early, Including Your Detractors

"There's no way that if you get participation out of a person can they say you didn't rock it." ~Jam Master Jay
Many organizations feel that the best time to begin engaging the end-user community is during the pre-rollout testing phase of a project. While this is an important time to be talking with the user community, hopefully you are engaging them far earlier than this. Otherwise, you are at serious risk of adversely affecting their processes/workflows.