WPMU Dev is a great go-to source for a freelancers and agencies who create WordPress websites for their own business or for other businesses. Some of their plug-ins are classics, like Smush It. If you can afford to join, it's worth the backup. It's like having an in-house expert when your Google searches are not enough and an answer is needed right away. I've found the folks at WPMU DEV to be very accommodating in serving their customers with friendliness and respect.