There are many apps you could use, but a couple good ones are TextPlus and UnlimitedTextFree.
You could probably download a free texting app, and connect to the internet via wifi (to allow the app to function).
If you have a text free app, yes, you can.
On the iPod touch you have to have an app to text if you do then your app has a number
If you have iMessage installed you can only iMessage other iDevices that has iMessage installed on them. If someone has an iPad 2 but not with 3G but has an iPhone, then the iMessage will go there iPhone.
you can do that in text app free
try to look for the app text now(free)
Free text messaging apps are available in the Apple App Store for IOS devices such as the Iphone and Ipod Touch. For Android phones, these can be found in the Android Market.
Yes, there is text plus or text with voice you can find in the app store
On most iPod Touch Phones the texting app is needed to be payed for.
Text now or text+
There are many apps in the App Store that let you do this, sadly though you have to pay for them. I personally use AIM for the iTouch and iPhone to text (Both free and bought versions have this feature). It only uses wifi so its free.
download app text now and the person u want to text.