Many forums have a marketplace section where you can post websites for sale, domains for sale, hire and looking to hire, your web design services, and so on.

• Marketplace.Sitepoint.com
• Ozzu.com/marketplace and job opportunities
• TalkFreelance Product Sales and Services Sales
• WebDigity.com Marketplace: sell your site, domain name, advertise your services, hire, etc.
• WebmasterAds.com
• WebDesignerforum.co.uk - template sales, services, and looking to hire.