什么是Comet:
http://baike.baidu.com/view/577938.htm?fr=ala0_1
Comet介绍:
http://www.ibm.com/developerworks/cn/web/wa-lo-comet/
Comet&Java实战:
http://www.ibm.com/developerworks/cn/web/wa-lo-w2fpak-comet/index.html
Comet Wiki:
http://en.wikipedia.org/wiki/Comet_%28programming%29
开源Comet框架Pushlets:
http://www.pushlets.com/
htmlfile实例:
http://blog.****.net/tzsmin/archive/2008/10/28/3165071.aspx