Features

You could waste your money on those other apps that do one or two things Enhanced SMS & Caller ID can do, or you can get the all in one solution now!

What can Enhanced SMS & Caller ID do?

Gmail Voice Reply allows you to reply to incoming Gmail messages with your voice!
SMS Voice Reply allows you to reply to SMS messages with your voice!
"Babel" allows you to specify a language that a particular contact uses. If a text to speech voice engine with that particular language is available, then Enhanced SMS & Caller ID will load and use it.
Language Auto detection allows you have the language of the incoming messages detected and the appropriate text to speech voice engine is loaded and used (if available on your phone).

Talking caller id (once, set number of times or continuous loop).
Caller ID notifications over call waiting.
Easily customize the spoken notification.
Can be configured to reads the incoming callers name, nickname or number. Name and nickname feature requires the caller be a saved Google contact.
Screen unknown and/or private callers. Unknown callers are those callers not in your contacts, while private callers are callers that block their phone numbers.
Toggle voice notifications on a per contact basis (and optionally mute the ringer).
Vocal message waiting indicator (requires support from your carrier).
Shake to silence talking caller ID (and optionally ringer) when you are not using a headset.

Reads your incoming SMS messages.
Reads your incoming MMS messages.
SMS/MMS Voice Reply.
Easily customize the spoken notification.
Ability to auto detect the message's language and load the TTS voice engine for that language (when that engine is installed on your phone).
Can be configured to "Shake to Stop" reading messages.
Reads your messages a configurable number of times.
Can be configured to only read SMS sender's name or nickname if sender is in your Google contacts.
Screen SMS messages from unknown senders (non contacts).
Screen SMS messages on a per contact basis.
Shorthand dictionary for you to store your abbreviated words and their longer meanings to make messages sound less cryptic.

Easily customize the spoken notification.
Ability to whitelist by sender's address or domain.
Ability to blacklist by sender's address or domain.
Ability to auto detect the message's language and load the TTS voice engine for that language (when that engine is installed on your phone).
Shorthand dictionary for you to store your abbreviated words and their longer meanings to make messages sound less cryptic.
Gmail Support.
Gmail notifications (Name only, snippet or name & subject [default]).
Gmail voice reply, a feature that allows you to compose and send messages using nothing but your voice.
Built-in support for K9 Mail.
K9 Mail notifications (Name only, snippet or name & subject [default]).
Built-in support for Kaiten Mail.
Kaiten Mail notifications (Name only, snippet or name & subject [default]).
Built-in support for AquaMail.
AquaMail notifications (Name only, snippet or name & subject [default]).
Shorthand dictionary for you to store your abbreviated words and their longer meanings to make messages sound less cryptic.

Can automatically start on phone power up.
Can automatically start with bluetooth headsets.
Obeys your ringer settings! Silent ringer disables voice notifications. Ignoring an incoming call also disables the voice notifications.
Homescreen widgets

Widget for quick enable/disable of Caller, SMS, calendar, K9 and Gmail notifications.
Widget for muting of voice notifications application wide.

Easily Save Data/Profiles for Backup and Restore.
Locale, Tasker & Probeez plugins.
Quiet time feature! Set a time interval where the phone should not provide spoken notifications.
Automatically pauses most media players when notifying you of messages.
Streams through a wired or wireless headset (Bluetooth headsets require A2DP compatibility, other Bluetooth headsets will not work).

Plus lots of other configuration options for you to play with.