2 deleted 1 characters in body

You can do margin kerning (aka “protrusion”) and font expansion in pdfLaTeX simply by loading the package microtype (i.e., by adding

\usepackage{microtype}

to the preamble). I also suggest using the tracking options option for small-caps, which increases the space between letters (which is typographically correct, but only for small-caps and all-caps text):

\usepackage[tracking=smallcaps]{microtype}

For further information (and for several fine-tuning options) you can consult the microtype manual.

Edit: Yes, in my opinion and (I think) in a typographer’s opinion, these features do make a lot of difference. Margin kerning and font expansion help pdfLaTeX typeset the text, producing a lot less over/underfull hboxes. Letterspaced small-caps are also more legible and much more aesthetically pleasing.

You can do margin kerning (aka “protrusion”) and font expansion in pdfLaTeX simply by loading the package microtype (i.e., by adding
\usepackage{microtype}
to the preamble). I also suggest using the tracking options for small-caps, which increases the space between letters (which is typographically correct, but only for small-caps and all-caps text):
\usepackage[tracking=smallcaps]{microtype}
For further information (and for several fine-tuning options) you can consult the microtype manual.