Forum breadcrumb class - where to start?

[eluser]jedd[/eluser]
Well, the MPT stuff is going straight over my head, but I'm curious how many levels are you anticipating with your forum - and what actual levels would they reflect. Can you give me an example of the contents of some of these breadcrumbs that you'd be displaying?

My approach is far simpler, because I settled on a finite (3 !) levels, and one of those has precious little meta data (message must be part of a thread, and consequently message pretty much just has an ID and CONTENT - so nothing to show in a breadcrumb, and indeed messages are never shown independently of their parent thread anyway). So in that sense, there's really only two levels that can change, and a static level above that.

What do you do, on the presentation side, if your MPT hierarchy gets quite deep?