This is the great links page to good game cheats, hints and walkthroughs site.
(Do note that some sites require proxy to be set <esp chinese site>
while others cannot be found if proxy is set,
just try with different combinations until you found one that works.)

English Games
Happy Puppy Front Porch - Good organized site with search engine
Game Guru - Ultimate search engine
Lord Soth's - Large database of trainers and editors
Ring of Ages - Abandonware ring, where age old games can be found

Chinese Games (Requires GB / Big 5)
Cellar - Great cache of Chinese and English games
Chinese Homepage - A homepage from China that contains some Chinese games cheats
Home of Chinese Games - Very good page for Chinese games
Xiao Nan - Another homepage with good Chinese/English games cheats