I have found that users don't always read the introductory paragraph.  A supplmentary approach can be to put your important message in a resources glossary with a suggestive concept name that is likely to invoke auto-text linking in the posts.
I have seen nudgin on some forums by posting a blank reply to push the post to the top but that's labour-intensive and a bit irritating to other users.
Stickyposts would be a good idea though.