PSYCHOS  Getting tired of posting comments on this obviously greedy developer's "tools."

Enough people have posted how to do this for free, in less time than it would take you to even read this page. Man pages for pretty much all of these tools are on the web, as well.  
(Version 3.0)

BORLOX  To convert the man page with title 'fubar' to publication-quality PDF:

Open a Terminal window.

Enter "man -t fubar | open -a -f Preview" (without the quotes.)

Yes, it involves some text entry, but if you're reading man pages you need to do that anyway.

Besides ManOpen, another free alternative to be aware of is Bwana.  
(Version 2.0)

JACKWEB  Man Viewer is only Leopard compatible :(  
(Version 1.0)

IGAUCHO  I've tried out VuMan (which is now open source) by this developer and this is certainly better. At least it has an uncluttered UI and it does just what it says. Very simple and it allows you to save man pages. I really can't see too many people shelling out $20 for man page viewer when there are better alternatives. Sorry, there's just nothing groundbreaking here.  
(Version 1.0)

GAOSHAN  Whenever I see a for pay application that has a solid, free alternative I feel like I should point out the alternative. If you need a man viewer this app may be perfect but you also owe it to yourself to check out the free ManOpen ( http://www.macupdate.com/info.php/id/6408/manopen )  
(Version 1.0)