Here is an idea to costomize your sound alerts if you are bored of the usual "ting!" :

http://www.acapela-group.com/text-to...tive-demo.html

With this software, you will be able to create a wav sound with someone that speaks (for example : "you have a long signal", "hey wake up, you have to buy!"), that will replace the default alert.wav file in the sounds folder.

A free alternative :

eSpeak: Speech Synthesizer