fusionBoard 4 is a huge enhancement to Fusion 7's standard forums. It updates the forums to compete with bigger, more complex forums without sacrificing the lightweight attribute that we all love PHP-Fusion for.

It is highly configurable through the admin panel, letting you turn on/off about any feature in the whole package

FEATURES
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» AJAX Chat panel (Tied to shoutbox)
» Warning system
» User labels in posts/latest active threads panel/profile (settings-based)
» "Invisible mode" for administrators and above
» Merging/Splitting threads
» Improvements to Hybrid/Fusion thread views, making them look better
» Buddy system
» Avatar Gallery
» Enhanced User Groups (groups will get their own comments section)
»» Groups can have a leader which has rights to manage the group.
»» Groups can be public (anyone can join), apply to join (leader/officer must approve applications), or invite-only (existing member can only invite)
»» Apply for user group/Send user group invite
» vB-style User CP / Navigation
» Option to not show post edit for moderators and above
» Show/hide forum categories on forum index through JS
» Social bookmarking (submit link to Digg/Facebook/etc.)
» Online/offline status
» Option to show today's birthdays or this month's birthdays
» "Hide Edit" Option on post edit
» Collapsible forum categories
» Ignore List (allows members to be "blocked" by each other)

Plus all the (improved) features from alpha 1 and alpha 2:

» Forum icons
» Multiple thread locking
» Forum statistics
» Reason for editing
» Multiple attachments
» Built in spell-check
» User titles
» vBulletin / Fusion & vB hybrid / Fusion / phpBB3 thread views
» Sub-forums
» Better forum rank icons
» Ability to change "Show My Signature on Post" during post edit
» Improved Latest Threads Panel (scrolling, etc.)
» Attachment download counter
» Post preview on mouse over
» Full admin control
» Time since post for posts/forums/index/latest posts
» Awards
» Auto-redirect after posting
» Track thread on Quick Reply
» Post ordering/sorting based on time/popularity/replies
» Forum rules
» Forum Announcements
» User labels
» Improved forum statistics
» User post ratings (thank you, funny, agree, etc.)
» Post Icons
» Forum Post Notifications