till & until

Till
E.g. I can't attend the meeting till noon.
There is a famous saying of "TILL," - Till death do us part.
Until
e.g. The product will not be available until one week later.

2009-03-18 04:22:35 補充：
http://www.gmat.com for the part of UNTIL example.

2009-03-18 06:06:34 補充：
For usage of these two words, can go to the following website for reference:

http://crofsblogs.typepad.com/english/2005/05/till_and_until.html

till 仍然 e.g. I till in office我仍然在寫字樓

until直致 e.g.My mother come to school collect me then i leave to school. 直致到我等到媽媽來接我, 我才離開學校