Please, please don't go to a modern forum! I absolutely abhor most of the phpBB forum sites I run across. Sure, it starts out with the conveniences of quoting, stickies, and smileys, but before you know it you've got half-page signature blocks with animated smileys and 90% of the content on each page is an auto-quoted copy of the preceding post.
In my opinion, people who don't have the time to pick up the basic html tags are probably not going to take the time to do selective quoting. As to smileys; I think Cameron's smileys are in themselves a persuasive argument.
Plain text is nice; plain text is easily searchable, plain text is easily read, and plain text maximizes the time I can put to better use chasing the local kids off my lawn.
Err... I just remembered this was originally only about stickies. Interesting idea if you navigate from the top of each forum, (which I don't). Perhaps a reference wiki might be more maintainable; most sticky threads I've seen run to dozens of pages which is somewhat self-defeating.