Re^2: My preference on serifs:

[blazar]

I personally believe that sans-serif is more readable, but not for long running texts. Thus it is reasonable to apply a sans-serif fontface to sectioning headers, captions and the like. Most importantly, it's not only my personal belief, but a common rule of good typography.

[Porculus]

Wow, apart from the IPB bit :) that's exactly what I was going to say. Of course, it's misinterpreted from time to time. One place I worked had their usability "experts" ponder that exact advice for some time, then decide that since long running texts were against corporate policy anyway, maybe they should pick a typeface that would encourage the composition of concise, clear documents!

Disaster ensued:

Dear Fred

Your new account has been created. The automatically-generated password is b1l0cI4l1I - please log in and change this to a memorable but secure password at your earliest convenience.

InnoCorp IT Services

Neatly typeset in Arial.