Sorry for the rather alarming post title :)
I stumbled upon Neutro in the trac and downloaded the theme and did see that the ”Caviar Dreams” font and the Font Nymphet License was still there (the theme review do reject themes including non gpl compat code/fonts/objects almost everytime, so you got lucky :) .
I read the thread in the trac for this version, and i think i can help you out with this.
The font Caviar Dreams is a Art Deco Styled font, certainly heavly inspired by some ”older” (everything is relative) comercial fonts.
For replacement, you could use fonts with the following GPL compatible licenses listed in the WordPress.org Make Theme Guidlines: http://make.wordpress.org/themes/guidelines/guidelines-resources/
But replacement for the Caviar Dreams Font, i did a little digging, and came up with this*:
You could also try to do a google search for ”Art Deco SIL Open Font".
*Note that some fonts have a limited character set. You may also tweak your CSS as the font x-height and weight can vary a lot between different fonts.
The Google Font Glyph Viewer is not working time to time, and just shows generic glyphs instead of the selected font glyphs.
You maybe know all of this, but i believe that this tiny ”guide" (in lack of a better word) may be useful for others.