If you don't like having to scroll through man pages with the arrow keys on iTerm, or if you just want them to look better, you can get your Mac to open them in Preview using an undocumented feature of the open command that's been mentioned on this site before. This bit of code...
...will open the manpage for whatever in a nicely-formatted Preview window. If you use tcsh as your shell, you can create a pman alias that will do the same thing by adding this line to your user's .tcshrc file, found in your home directory:
man -t whatever | open -f -a /Applications/Preview.app
[robg adds: This hint is somewhat of a roll-up of a number of other existing hints, but I felt it was worth publishing on its own, due to the simplicity of the solution. Although the command will work in 10.3, Preview won't render the postscript output; you'll just see the raw code. And thanks to fds for the first comment, pointing out the error of my ways in rying to make a bash alias out of this command!]
alias pman "man -t !:* | open -f -a /Applications/Preview.app