Corporate GMail

Google to offer GMail with your domain name. Still beta? Sign up here.
With rumours of a calendar and web page editor, plus the recent GTalk integration on the horizon, they are coming closer to being a viable corporate platform. We are using Yahoo! Small Business now, simply because they offered hosting and email for a cheap price. Unfortunately, it's not exactly GMail. Optimally, GMail would be a product we could host ourselves (on an appliance?), but that's probably just me dreaming again.