Can I change the font or the font size of a notification?

Styles

Can I change the font or the font size of a notification?

Some of the styles (e .g. Minimal or Sony Playstation) have settings where you can change the font. See Snarl Settings - Styles - choose a style - press the button Settings.

For installed styles being based on the EZ Styles API (as e. g. the included Glass) please search it in the style installation folder (something like C:\Documents and Settings\YOURLOGIN\Application Data\full phat\snarl\styles) and look for a text file within the style directory matching the name yourscheme.scheme and change the values there.