WebSphere Integration Event Broker

I was looking at IBM WebSphere Integration Event Broker documentation. Does any body know any other similar/competing products?

I am looking for a solution/technology , which can listen for certain application events and then trigger a set of actions. for eg, the cellphone customer decided to opt for email notification when his bill is ready. my component or service gets the user preference and stores it somewhere and then generates the bill according to his preference. i.e, send his bill via email rather than sending him a paper bill.

I was introduced to this IBM product as a way to create rules and design a system as a way to acheive a similar solution.

Any thoughts/ideas are greatly appreciated.

Thanks,
Aparna Sharma

http://www-306.ibm.com/software/integration/wbieventbroker/library/