Well I have just launched my music website <<< URL Removed>>> . its basically using new inhouse code that intergrates static content with dynamic features. But id really like to test the durability of the code and website under heavy load and traffic and see how affective and durable it would be, basically ensuring that it could sustain itself under those conditions.

Is there any website, program, or service that can help me with this ? Id really hate to start gettng visitors and then find a major bug down the line.

thanks for any help

I did a very quick search for such a program and came up with MoniForce & WAPT:
http://www.moniforce.com/
http://www.loadtestingtool.com/

It's probably worth at least a glance to see if it's something you'd want.