What's a secure way to message/talk to someone in CM9? I'm using CM9 nightly (20120712 i.e. today).

I need to talk securely, without the chance of eavesdropping, to someone who also has CM9 nightly (not sure how up-to-date but not more than 1 month old).

What apps/webapps can I use to do this? Ideally I would like to be able to talk but messaging/email would be fine.

Are apps like Twitter/Gmail/Gtalk secure end-to-end? I do have HTTPS set up on my account but don't know how far it applies to the mobile version.

But really I am willing to use anything as long as it known to be secure enough to prevent MITM attacks and eavesdropping by unwanted parties.
I found the following but I don't think this is a definitive answer though it looks close to what I need, secure end-to-end encryption with no chance of snooping/sniffing/MITM.

http://en.wikipedia.org/wiki/Off-the-Record_Messaging#Phone_apps

I wasn't fully aware of OTR though I had heard the term used elsewhere but didn't know the full implications. I think OTR is what I'm looking for. 

Still looking for further input though.