>Leaky expansion tank around the sensor, or
>bad level sensor, or
>compression gas in coolant, or....

The reason I was concerned was that the owners guide seems to indicate that
this may indicate an over-temp situation.  They weren't really clear on it.
I had checked the level and it seemed fine, but I REALLY didn't want to
toast the engine.  :-)

I ended up letting it cool down and having dinner, then watching the temp
gauge and it was acting as it normally does...  The needle was just above
where the LED is (basicly the middle of the operating range), and I knew
the level was ok, so...  I just ignored it.

Once I started ignoring it, it went away after about 30 minutes.
<shrug>

I'll probably go ahead and just replace the coolant level sensor in the
next couple of days.

Thanks for the input everyone.

Evelyn