Bold/Italics?

How does one affect the font weight, ie: bold, italics? Is it done by 
changing the name of the font?

Also, the new core isn't rendering. Something weird is going on. I 
could spend a few hours now trying to work out what/build a test case, 
but instead I'm going to spend the time getting a WYSIWYG demo going.

The core I'm using now can be found:
    http://repo.zentus.com/ibex-smallmerchant

(which is basically the core Tupshin maintains on 
darcs.smallmerchant.com)

-- d