Here you go:
http://haris.tv/2007/02/28/activecollab-and-071-hack-for-task-comments/

Welcome!

Regarding the request you made to make task text less intrusive; see here for updates:
http://www.activecollab.com/forums/topic/1453/

You can post comments (and much more) on tickets, but not on tasks that are part of a checklist. Basically, if you need more firepower for a task than simple summary, assignees and priority you should always create a ticket.