differences: in [Shia Islam][1]:

 1. method of Wiping the Feet During Ablution (Wudu)
 2. In Shia Islam it is permitted (but not recommended to not combine)
    Combining the Prayers
 3. in the The Adhan (Call to Prayer); Shia say “Hayya ‘ala Khayril ‘Amal” (Come to the
    Best of Deeds) (shia believe this was removed from Azan by Muaviyeh)
 4. Shia does not Crossing the Hands in Prayer and keep them hanged.
 5. Concluding the Prayers with Three Takbirs (Saying: Allahu Akbar!)
 6. Prostrating on Earth (or part of earth like Turbah or a stone)
 7. it is recommended Pray on the Soil of Karbala
 8. Prayers for the Dead (Salat al-Mayyit)
 9. Tarawih Prayers is recommended by performing it in Jamaat is Haram


----------


**Reference and detailed answer ans reasoning:**

Chapter 13 of the book: [Inquiries About Shi'a Islam][2] (by Imam Sayed Moustafa al-Qazwini)


  [1]: http://en.wikipedia.org/wiki/Shia_Islam
  [2]: http://www.al-islam.org/shiism/