I posted a poll on liferay.org (lower right) asking about preferences for viewing individual threads. We used to have this feature before the upgrade, and before we bring it back, we want to know what style of viewing is preferred. If a big majority prefer the flat (default) view, we may just not bring it back (saves us time!). Or if there is some other clever way to view threads, we can look at that (but anything super-fancy, and involving tons of customization and massive javascript hacks probably won't get done).