Lets users on your blog chat with you live through Google Chatback. If you are offline it links to your contact form instead.
Double your sales with Live Chat widget by ZaZaChat
Provide Live Support to your Customers with Live Chat widget by WebsiteChat.net
A plugin that ease the integration of the iAdvize livechat application
WP Chat embeds Jaxl IM which is a simple easy to use communicator for websites with Instant Messaging, Social Networking and Sharing capabilities.
Chat.Help.Sell. LiveHelpNow Help Desk Software – Live Chat, Tickets, Knowledge base
HelpDen – Live Support Chat. This plugin integrates HelpDen with WordPress – an application for online live customer support.