Handcent SMS is a free enhanced SMS and MMS application for Android.
It fully unleashes the power for your Android device's messaging capabilities, including:
Compatibility with all existing Android devices including HTC Dream, HTC Magic, HTC HERO, MyTouch 3G, Motorola Cliq, Motorola Droid,Samsung Moment, Motorola Tattoo,HTC ERIS, Google Nexus One, HTC Desire, HTC Legend, Sony Ericsson Xperia X10, etc. ... More Info »
Full Support for SMS and MMS including attachments for pictures, video, audio, vcard,etc.
Unsurpassed customizability; define any aspect of the application's appearance through the many options in the settings menu
Powerful SMS popup Window that includes SMS Templates (Quick Text), Speech Recognition and text-to-speech for Speaking SMS messages
Group Send SMS & MMS messages easily using individual or group selection options that sync with your device's contact database
Beautiful user interface that includes customizable themes and conversation styles such as iPhone's bubbles
Define unique ringtones, vibrate patterns, LED blinking, backgrounds, signatures, and conversation styles for individual contacts
Supports additional font packs that can display your messages with countless additional fonts to suit your style
Support for more than 20 languages and growing as well as support for the various messaging protocols of different countries
Many more useful features including Blacklisting, SMS and MMS search, as well as Batch Mode for threads & Messages....
Features the Handcent keyboard plugin (a T9 keyboard with predictive text)
Additional security options allow you to password protect and hide individual messages with the Privacy Box or secure all of your messages
Schedule tasks to deliver SMS and MMS messages at a specific time or regular intervals such as daily, weekly or monthly
...many more functions are in development