All of my plugins are 0.9 compatible – if not, I will make them so, just give me a bug report. You should always be using the newest version of my plugins BEFORE you upgrade.
Virtually all of them tested working under the current beta. “Admin Instant Menus” may stop working if the WP menu system is folded into bbPress before release.
“Year Long Cookies” should not really be necessary any more because of the new 0.9 “Remember Me” option on login, unless perhaps one has a forum on an intranet and you don’t want to bother people with logins, ever.