I was kind of sorry to see that so many people had S60 troubles.
I bought my pre-owned 2002 S60 in 2007 @ 90,000K knowing very well that I'd own it for years to come.
It's nearly 2011 now and I still haven't had anything unexpected.
This is my second Volvo (first being a 1996 850) and it's true they are extremely expensive to maintain, but I haven't had unexpected issues, as I've always gone to the Volvo deal for every single last part on the car/service.
Things that needed replacement for were:
+ Fuel Filter
+ Muffler (I live in New England, they go quickly with rust)
Other than that, the car is now at 170,000K and seems to be going well.
Dashboard layout and design.... very pleasant to the eye.
Seats are extremely comfortable and well designed :)
I feel it's already been addressed with the new 2011 S60, but the rear blind spots.