I found this in my notes at home, so thought I would share it with you all.

Always Masculine: Days, months, season, points on a compass, map locations, names of cars and trains, words ending in -ismus, words ending in -ner,

Usually Masculine: Most occupations and nationalities, words ending in -er, names of alcoholic drinks (except das Bier of course), names of mountains and lakes, most rivers outside of Europe, nouns ending in -ich, -ling, -ist.

Always Feminine: nouns ending in -heit, -keit, - tät, -ung, -schaft, nouns ending in -ie, names of aircraft, ships and motorbikes, nouns ending in -ik, cardinal numbers (eg eine Eins, eine Drei (a 1, a 3))

Usually Feminine: Nouns that end in -in, -e, or -ei, Most types of flowers and trees

Always Neutral: Nouns ending in -chen, or -lein, infinitives used as nouns (eg Das Essen), almost all the elements on the periodic table, names of hotels, cafes and theatres, names of colors when used as nouns.

Usually Neutral: Towns, countries, continents, young animals and people, most metals, nouns ending in -o, -nis, -tum or -um, fractions, most nouns beginning with Ge-, most borrowed words ending with -ment