It is so very important for a designer/developer, freelance or otherwise, to have their own site. Personal branding is a crucial part of doing business online. The advent of the Web has made the world an incredibly small place and so competition for work can be fierce. One way to combat that is by building a strong brand for yourself, getting information about what you’re good at out into the public, and proving value with examples.
If you are a designer, developer, entrepreneur, or just someone that wants to get their name out there; I suggest following Jonathan’s lead. Kudos Jon, nice step forward.