I guess we still don't have concensus here then

With my Shammy team leisurely cruising to 80 (77 at the moment), I use one Tremor Totem in PvE and three - unstaggered - in PvP just to buy me some time to kill people before they totem-stomp. I couldn't think of any way to imperically prove whether they stack so I haven't actively tried it out myself.

I do find the Earthern Power pulse argument quite compelling though.

Thanks for the hint on breaking stealth too. I can't help feeling there must be more than just improved earthbind that breaks stealth though, so I'll grab my poor old level 60 rogue for some experiments in duels over the weekend and report back!

edit: readability FTW!