Thanks Brian. Did I fail to RTFM :-) I hope not.

I studied a nicely done vario project here using the BMP085 and C30 compiler.
http://www.pixelproc.net/pic24bmp085lcd.html
Didn't mean much to me unfortunately as it's a very busy bit of work.

Yes, I like the simpler add many then divide way of averaging too, it always works well.
Martin