What I see in my case (i7 - 256) is around 50-60 degrees when idle and up to 90 under heavy load. I might have occasionally read 91, but definitely never 98. It gets hot when this happens, but when idle or under light load the fan doesn't spin up. Occasionally, Windows runs some maintenance jobs that will make get warm when it's idle (and stop as soon as I touch my mouse), but this also doesn't happen all the time, only occasionally.
Even though this is hot, I can't see any indication of this not being a normal behaviour, the CPU is cool when it is not under load and the fan doesn't spin up randomly.