It will not take much longer and all messaging services out there are supported by Home Assistant ;-). In the dev branch is now support for Telegram. This means that you can now choose between seven (7) different instant messages solutions.
If you have a minute or two to spent, then it would be nice if you take Home Assistant and Telegram for a little ride and report all bugs. Thanks.
I guess that this notify platform will be included in the up-coming 0.7.5 release.