The new service allows anyone with a G1 using roaming data services or WiFi to connect to the Raketu mobile services to make phone-to-phone calls, send sms-text messages and email, send and receive instant messages, store and share pictures, and more, all without a download.
Current Raketu users can start using the new services immediately, and new users can sign up at http://G1.Raketu.com or http://Android.Raketu.com.