Have you thought about how important your email address is to your business? It's all part of your branding. I saw a funny post on a forum this week which outlined different email addresses that told it all - desperate for a job, desperate for a partner, just desperate and so on. Some email addresses look too much like spammer's addresses.

When you're in business you need to be taken seriously - even on forums like this one. So your username and email address are an important part of your identity for your business and will help with your branding.

Even if you don't have a website yet it doesn't hurt to get a domain name and use it for your email addresses. Later when the website comes you'll already have your domain and your email address won't need to be changed.