queue manager for incoming connections

[Nicolas de Bari Embriz Garcia Rojas]

Hi all, any idea of what software or utility can be used for queuing  
all the incoming messages, I am having problems processing many  
incoming petitions, kannel works perfect it passess all the incoming  
connections seding them to a php code for dispatching the requests  
using get-url but when to many connections income apache/mysql just  
die they reach their limit. so  i am loking for some kind of queue  
mechanism so it can store all the incoming messages and then process  
them with out eating all the memory on the server.

regards