If you want to be an entrepreneur, it's not a job, it's a lifestyle. It defines you. Forget about vacations, about going home at 6 pm - last thing at night you'll send emails, first thing in the morning you'll read emails, and you'll wake up in the middle of the night. But it's hugely rewarding as you're fulfilling something for yourself.

Skype is for any individual who has a broadband Internet connection.

Today as an entrepreneur you have more options.

It's extremely hard to build a company with a product that everyone loves, is free and has no business model, and then to innovate a business model. I did that with Kazaa, had half a billion downloads but that wasn't a sustainable business.

You shouldn't be afraid of failure - when something fails, you think, 'What did I learn from that experience? I can do better next time.' Then kill that project and move on to the next. Don't get disappointed.

They also can combine voice with instant messaging and online file sharing.

If you could utilize the resources of the end users' computers, you could do things much more efficiently.