I find the philosophical tracts are often quite useless unless placed in a proper context.
For example, Rosseau's work in itself may contain interesting ideas, but what makes it significant only becomes apparant when it's placed in a historical context. many of his ideas will ring true today, many others will have been ripped to shreds intellectually, or shown to lead to horrible consequences.
so:
how it proposed a way of thinking that was different from what had come before, how it became 'romanticism', yet can still be seen as part of the wider 'enlightenment'
how his ideas became central to the revolutions in France and America,
how he influenced the ethics of the major philosphers who followed.
And it must all be seen in the context of the major social upheavals that occured in the Industrial Revolution, and the boom in the availability of books.
<a class="postlink" href="http://www.amazon.com/Birth-Modern-Mind-Intellectual-Centuries/dp/1565857283" onclick="window.open(this.href);return false;">http://www.amazon.com/Birth-Modern-Mind ... 1565857283</a>
for the story of medieval thinking>empricism>enlightenment>philosophes>romanticism
150 quid, for a CD-ROM? no, I didn't pay that either ;)
<a class="postlink" href="http://www.bbc.co.uk/programmes/p0038x93" onclick="window.open(this.href);return false;">http://www.bbc.co.uk/programmes/p0038x93</a>
Interesting discussion on the 'Encyclopedie', which Rousseau and his companions collated, and how it became the key document which inspired/guided revolutionary thinking.
who has the time to read books anyway?