What are the traditions, with their proper references, about the reward of Salwaat and Durood on the Prophet Muhammad Al Mustafa (s) and Aale Muhammad (a)?
There are hundreds of authentic narrations on the great reward of reciting Salawaat on the Prophet and his holy Progeny. You can find many of them in main the books of Hadeeth, like A-Kari,Al-tahtheeb,Al-faqeeh and Al-istebsar. There are full books on this subject. There are authentic narrations that any believer who recites Salawaat, the angels will pray for him as far as he is reciting Salawaat. And they don't stop praying for him unless he stops reciting Salawaat.
wasalam.