SMS+ was just made available in Cydia for jailbroken devices and adds a whole lot of functionality to the stock Messages app. A lot of people may argue that apps like BiteSMS already do all that SMS+ does. If you're someone who prefers the stock messages app, this may be a better choice for you. The price tag is also a bit more manageable as it's priced at only $1.99.
Once installed, you can pop into settings and customize what options you'd like to add. There's no new icon like there is with Bite. This app integrates tightly with the default Messages app.