The story thus far:

Uninformed about the vagaries (read problems) with this year and model,
I bought it used with ~70K miles on it. I spent about $12K back in
2003. I have since put about that back into the car in the form of a
new engine, new PS pump, new tires, new this, new that, and keeping the
codes down. The new engine and PS pump were used, but they were new to
me and better than the dead ones.

AFter the nu-used engine went in (this is summer-04), the Check Engine
light came on, intermittently, but more often than not. Also, the Check
Emissions warning came on, again, intermittently, but again more often
on than off. I finally moved to a state where they take their emissions
testing seriously (Virginia) and have been told that I must get
whatever is ticking the codes fixed.

I got myself an ODBII reader and discovered that there were some actual
problems with the system.
I took it to an independent mechanic who specializes in cranky
Scandananvian autos. They fixed a broken tie rod, replaced the two
tires that hadn't been replaced before, sealed some vacuum leaks,
charged me about $700 and said something really weird for a mechanic to
say, after holding the car for only about two days. What they said was
roughly like this:

Well, we've done what we can do, but there's something with the front
O2 sensors that we just can pin down. We switched em with the back ones
and we switched em left to right, we done did everything we know how to
do, and the damn light won't go out.

I was amazed, as my experience has generally been either of two
options: 1- hold it a lot longer, fix a bunch of junk that might be
related and run up the billable labor hours or 2- clear the codes and
send me on my way, hoping it doesn't pop again. Anyrate, the big advice
here was that it had to go back to the dealership.

I took it to the dealership they recommended, and was told that they
needed to replace the "oil seperator (PCV box)" to continue with
diagnosis. They also did a software update. I did a little research and
asked if this could be cleaned (according to Volvo's TSB on the matter,
it should be, and it's a lengthy process to get it out), he said "No,
and if we wanted to, we'd have to do all the labor of replacing it
anyway, and that's the major component of the $800 pricetage for doing
it. Oh yea, we can't guarantee that this will fix the problem, either.
One last bit of salt, the part for a Chevy costs $2, but for your car,
it's $150." That's not all direct quote, but it covers the substance of
what he said (he did mention the relative cost of PCV boxes for Chevys
and Volvos, which I think was a little cruel).

Anyrate, I said, "No Deal." After an experience getting the car back
from the dealer, I drive it home, notice that the emissions service
light isn't on anymore, and plug in my ODBII code reader. My results
follow:
Codes:
p0442 EVAP Emission Control System Leak (small)
MIL light:
ON (don't need an ODBII reader for that one)
Mointors:
0 Incomplete
7 Ready
Misfire
Fuel
Comp
Catalyst
Evap
O2 Sensor
O2 Sensor Heater

So, I guess the question is: Is this p0442 something related to the PCV
box? Should it really take $800 to fix this? And if there are any
experts on Virginia Emissions Testing, is this something I'm gonna get
flunked over?