[iBook] optimum angle for viewing screen

[/ dave /]

For those who know, or just those with an opinion, what is considered to 
be the "proper" angle for staring at an iBook screen - straight on (i.e. 
90 degrees perpendicular to the surface), or a skewed a few degrees up? 
When doing photo work, a slight difference in viewing angle makes a big 
difference in terms of getting the contrast/colors right. Which is 
probably why a free-standing monitor is best for such work, but I 
thought I'd ask just the same. What do the innumerable graphic designers 
I see toting laptops around do - guess? Print lots of proofs?

Also, what have people found to be the best process for setting up an 
accurate color profile for doing pre-press (CMYK) work in Photoshop on 
an iBook? Is there a good online FAQ or guide? I have a custom profile I 
set up for which I've done a significant amount of comparison between an 
original photo and my scanned/tweaked version on many kinds of monitors 
(with an eye toward getting it as close as possible for the web, on as 
many monitors as I can), but pre-press is a whole 'nother thing. Any 
thoughts would be appreciated.

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/  dave  /