The clock on my SS5/110, running 1.5S, drifts constantly, but only when the
	machine is busy (that is, only when I'm at work using it). I've included
	several days worth of NTP logs below, showing drifts of several seconds an
	hour, but not at night and not over the weekend. Is this normal? Does my clock
	just suck? Is it a Sun hardware thing?

That seems to be a common problem with recent kernels.  They appear to
lose clock interrupts.  Maybe other interrupts as well.

Eduardo