[kgeist]

>You can also see remnants of the old system here and there in Latin, Greek, Sanskrit, Russian, ect.

For example, there are some adjectives in Latin and Ancient Greek, which only have two declensions instead of three: one common declension for masculine/feminine, and one for neuter.

For example: naturalis (masc), naturalis (fem), naturale (neut), as opposed to novus (masc), nova (fem), novum (neut).