Today Google released the Voice and Video chat feature to its Gmail. Switching from email to chat as needed, all within the same app, is really great for productivity.
From Gmail Blog:
All you have to do is download and install the voice and video plugin and you are ready. And in the spirit of open communications, Google has designed this feature using Internet standards such as XMPP, RTP, and H.264, which means that third-party applications and networks can choose to interoperate with Gmail voice and video chat.
This feature is available both in Gmail and Apps account. Seems like Google will soon steal the market share of Email Service. Presently Yahoo tops the list – Comscore figures.
The problem with Google not listing in the top might be, many people with a domain will be using Google Apps google.com/a/domain.com instead of the default gmail.com.