<p>We have many WIDE html grids which scroll horizontally within a DIV in our web application.</p>

<p>I would like to find the best strategy for printing these grids on a portrait A4 page.</p>

<p>What I would like to know is what is the best way to present/display grids/data like this.  </p>

<p>This question is not HTML specific, I am looking for design strategies and not CSS @page directives.</p>

I guess it really depends on what your purpose is.
In a book format
: I usually try span two facing pages.
For a conference or poster
: Find an extra wide printer and print it out on a large sheet of paper.
Something more informal
: Span regular pages and tape them together.
Powerpoint
: Don't show the whole chart, they'll not be able to read the details anyways, just show the relevant information.