[OS X TeX] comprehensive font families and abbreviation?

[Duke]

Hi folks,

I want to change font properties for just a single sentence (or 
paragraph), and after googling I came up with

{\fontfamily{FONTNAMEABBR}\selectfont
The quick brown fox jumps over the sleazy dog.
}

where FONTNAMEABBR is the abbreviation of the font family that I want to 
use, for example, cmr for Computer Modern Roman, phv for Helvetica etc. 
I have two questions:

1. Where can I find a comprehensive list of font families together with 
samples AND abbreviations? I found the following list with nice sample

http://www.tug.dk/FontCatalogue/allfonts.html

but I dont know how I can use these fonts because there is nothing about 
their abbreviations.

2. How do I know the font I want to use is already installed in my 
system and that I can use it?

FYI, I use 10.5.6 with MacTex 2008 (full package).

Thanks,

D.