To my surprise, I found out while installing Fedora 8 on a new laptop, that the stix fonts have made their appearance as a rpm package in the Fedora distributions as a bundle:

• stix-fonts-variants.noarch : STIX scientific and engineering fonts, additional glyph variants
• stix-fonts.noarch : STIX scientific and engineering fonts
• stix-fonts-pua.noarch : STIX scientific and engineering fonts, PUA glyphs
• stix-fonts-integrals.noarch : STIX scientific and engineering fonts, additional integral glyphs