Great utility! Man pages look really nice, Safari is always opened in my desktop so Bwana is available right there at the tip of your fingers, and links to mentioned man pages are very useful.
As a side note, I call it via Sogudi, this way I can type a space instead of a colon (I prefer it and in addition it is consistent with the rest of shortcuts), and can easily have a perldoc alias for man, which looks more familiar to me for Perl documentation.