We all know the famous expression
RTFM. The
man command is our best friend.

But what to do if you've just downloaded something and want to read a manpage that was bundled within? Here's the command to use:
groff -t -e -mandoc -Tascii filename | less
The output of that
groff command is still not pure ASCII. It contains escape sequences for marking bold and italic text. However it's only a good thing if you're piping the output into
less since the latter is capable of interpreting those escapes and can show you bold/italic/etc. texts.
However if you really want to have an ascii version of the manpage (eg. to save it into a text file), you can remove the escapes with
col:
groff -t -e -mandoc -Tascii filename | col -b > filename.txt
The above
groff commands produce pretty much the same output that you get by invoking the
man command. This means that you can save the rendered output of an installed manpage into a text file using
col too:
man sometopic | col -b > sometopic.txt
Update (2010.06.24): it seems somebody realized the usefulness of a "wrapper" around groff that would make reading manpage files easier. Today in most distributions you can use the following syntax:
nroff -man filename
(and pipe the output into
col -b if you want a pure ascii output)
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