Will they take my E-Z Pass?
Toll roads in Florida don't accept them...seems unlikely Texas would.
I don't think so. You need a TxTag: http://www.txtag.org/.
However, that works everywhere in Texas. The Dallas and Houston tolltag authorities have their own tolltag, but they also work everywhere in Texas.
You can still drive on the tollroads. It will just snap a picture of your license plate and mail a bill to the address on your registration. However, it's about 50% more, at least where I drive.
I don't know if they send the bill for just one or two tolls.
Will they take my E-Z Pass?
If the EZ TAG and the EZ PASS are the same thing then you are good to go.
http://www.texastollways.com/austintollroads/english/pay.htm
TxTag is accepted on toll roads statewide. You can get your TxTag online or by phone at 1-888-468-9824.
The Dallas/Fort Worth area TollTag and Houston EZ TAG are also accepted on Austin area toll roads.