After "living online" for over ten years now, I've managed to accumulate a few email accounts and am now on Facebook and MySpace. I have to admit, I'm not great at checking all of my email accounts staying on top of my messages. I use a website called Fuser (Link) that let's me read my email, MySpace and Facebook messages from one inbox. I can reply, send, delete - pretty much everything I do from my regular email service. I can also organize messages across services into folders - family stuff in one, work in another, etc. Works for me!