I ended up doing my LIM gaskets at 62k miles. I had a slight coolant leak on the bell housing and was losing about a quart of oil between changes (normal 3k mile interval).
Other than that, up to my current 66k miles, I've replaced the following:
Front wheel hub
Both axles (only one was bad, inner joint passenger side)
Pads and rotors all around
Passenger rear caliper for seizing up
LIM gaskets
UIM gasket
Dexcool swapped for yellow Prestone universal
On my third set of tires (stock Goodyears sucked, uniroyal replacements sucked, Bridgestone Potenzas G009s are awesome)
Both coolant elbows (again, nothing wrong, but while I was doing my gaskets I figured I should)
Then there's the normal stuff.
Oil & filter
Changed tranny fluid/filter twice (1st at 45k miles with generic fluid, 2nd at 65k miles with Dex VI)
PCV valve (only use ACDelco, autozone brand caused me to lose a little oil, and the ACDelco was cheaper)
Air filter (but now I have a WizAired)
I've only had 40k miles experience with this car (bought it at 26k miles all highway). But, I've come to know it well and have been pleased with how things have held up. I did notice at one point that my power steering fluid was low. Filled it up with STP stop leak power steering fluid and it's been steady ever since.
Overall, I feel the W-body is a tried and true platform. The 3800 is the toughest engine GM has ever built with a nearly bullet proof (stock form) bottom end. I've only heard of one 3800 grenading its bottom end as a stock engine. He rebuilt it with better components and now has it turbo'd. (and I'm not so sure I believe it was stock to begin with

)
On the Impala side, people by 9C1 (cop cars) all the time with lots of hard miles on them (100k+) and they just keep going.