Apple users have their secure way of sending messages through iMessage, but right now Android users are a little left out. CyanogenMod hopefully have the answer to this, where the team are working on a new application called PushSMS.
Devleoper, Koushik Dutta said this week that he has constructed a secure push-based messaging plugin for CyanogenMod which encrypts messages between two CyanogenMod users from end-to-end and is sent over the Google Cloud Messaging service. Dutta adds that the feature is built directly into the CyanogenMod framework, and is compatible with third-party clients like GoSMS and Handcent.
PushSMS isn't quite available, and should arrive in a new iteration of CyanogenMod in the coming weeks.