Okey, but it seems to me like many of the topics posted in here are topics about specific errors, bugs, issues etc.
I read almost all topics posted in here every day, and to me it seems like you spend quite some time telling people they need to use the search function as "this and this" topic has been covered well before.
Why not make a new twist to the post function.. something like this:
When a user post a new topic, they will first be redirected to a new page, showing the 5 topmost topics that seems to be relevant to the users question. If they then still feel they haven't found what their looking for, they could press the submit button on that page, and the post will then be sumbitted.
Doesn't that sound like a good idea?