To be honest with you, I didn't intend for it to be that helpful. You know, one bad ettiquette technique to another.
OK, coming off the soapbox now... I don't remember anymore. I spent a few hours looking for this exact same thing for a site I developed, and finally found it, but I remember it took a while to find it.
Try doing searches there for things like "short URL", "URL redirect", "subdomain", etc...
You should be able to find one pretty easily.
At a quick glance, I searched in the php category for "subdomain" and I found one called "myLoungeRedirection" there, but I don't think I should post the URL... Not sure if that's cool to do or not.
Anyhow, good luck with this.