A bit more info:

I am not using a proxy on my home lan, their is just a router sharing
the boroad band connection etc.

http://kh.google.com/movl?ov=52&t=ttqr
works in both browsers.

http://www.google.com/mars/
NS: google banner across the top with three 'buttons' on the right
labeled Elevation, Visible, Infrared and an elevation scale along the
bottom left hand side of the screen, the rest is a blank grey.
IE6: I get the above BUT no 'buttons or elevation scale.

http://maps.google.com/
NS : Google banner across the top, text 'example searchs' etc along
left hand side and a large blank grey area on the right with overlaid
'buttons' Map, Satellite, Hybrid.
IE6: The above page 'flicks' into view rapidly followed by IE6
presenting http://maps.google.com/?output=html . If I enter
"London Waterloo UK England" [anything less gives some place in the
USA] I seem to get a working map that I can zoom with adverts to the
left.

So If I then enter http://maps.google.com/?output=html in NS, I get
thesearch page and by entering "London Waterloo UK England" I get to
the same page as above in NS.

Seems like some 'front end' scripts are not working correctly in NS /
IE6 on my installation, but once 'past them' the service works -
but not http://www.google.com/mars/ !!

Unlike the IE6 page, the NS page of http://www.google.com/mars/ does
respond to clicking Mountains, Canyons etc and I end up with lists of
features along the left hand side, if one is clicked ie
Mountains - Arsia Mons Mosaic, I get a 'moving info dialog' appear
form the right hand side with 'Article: Arsia Mons Mosac' along its
top, some info and a small mars image on it. The main page under it
is still a blank grey. Clicking on the image or article link
transfers to http://themis.asu.edu/zoom-20050613A.

In summary IE6 no dice, NS some dice but no maps!