My online alias is used for pretty much everything I do, or at least every game related website I need to register for. My alias is 99% unique on the internet so you will never find another Diomeneus out there that isn't me. The reason for it is that it is a completely non existent name. It sounds like a Greek hero (and is indeed simply the melding of two of them together) and that was pretty much my goal.
Getting to the point of all of this.... search up Diomeneus in google. It has a scary amount of information about me including my real name and where I live. It even has my poxnora account and posts I've made on D&D forums and digg articles.
It is interesting to note how much somebody can learn about you from your online handle. I can't help but be reminded of various times I've intentionally pissed people off online and thought "pffft, it isn't like they know who I am". Not only would they be able to find out who I am and where I live, but they could easily verify due to the various profiles that I so graciously fill out that it is indeed me and no chance of being some other Diomeneus.
Now obviously you all will not find this nearly as cool as I did, but for those of you with unique handles that you use frequently I suggest giving it a try and see how much you can learn about yourself online. It's neat.
And the next time some jackass with an obscure handle starts giving you an earful of verbal rape see how much you can find out about them. Maybe you would even find their email in there (I found mine easily enough) and you could send them an anonymous rebuttal to their eloquent comments about your personal hygiene.
Only if it isn't me though. :P