Here’s a short article summary I found interesting…

Couples Rush to Marry on June
6 (June 8, 2006, China Radio
International)
Shanghai saw thousands of local couples rush to tie
the knot Tuesday as the date — June 6, 2006 — contained three sixes, believed
to be an auspicious day for marriage in Chinese tradition. The number six
signifies good luck in China, though the triple may
represent evil in the Western world. According to the Shanghai Marriage Registry
Office, over 1,400 couples registered to marry on June 6 across the city. Only
about 200 couples register on an average day. Officials at many local marriage
registrar offices began work earlier than usual Tuesday morning and even skipped
lunch as people lined up in and outside offices all day long. Mr. Qi said he
arrived at the office right before it opened only to find 108 couples waiting
ahead of him. He waited three hours for his marriage certificate.

A number that is not good here in China is the number "4".  In Mandarin, the word for four is "si" (suh).  Si, in another tone, is also the word for death.  For this reason (as an un-superstitious foreigner) you can often get a cell phone number at a reduced rate if you ask for one with the number four in it.  Believe it or not.