Surah Yaseen is the 36th surah in the Quran. It has 83 verses, and got its name by the word 'Ya' and 'Seen' in its first verse.
Among the goodness of reciting surah Yaseen are:
The Prophet saw said, ‘Surely everything has a heart, and the heart of the Qur’an is Yasin. I would love that it be in the heart of every person of my people.’
[Bazzar]. (S.Muhammad Ali Sabuni, Tafsir-al-SabuniVol.2)
Ibn Abbas radiyallahu anhu reports Rasoolullah saw saying, "My heart’s desire is that Surah Yaseen should be present in the heart of every individual of my Ummah."
(Al-Bazzaar)
The Prophet saw said, ‘Whoever recites Yasin once Allah will record the reward of reciting the Qur’an ten times.’
[Maqal, Tirmidhi 2812/A & Dhahabi]
'Ataa' bin Abi Ribaah r.a. says that Rasulullah saw is reported to have said, "Whoever reads surah Yaaseen in the beginning of the day, all his needs for that day are fulfilled." (Darimee)
The Prophet said, ‘Whoever recited Surah Yasin in the night seeking Allah’s pleasure, Allah would forgive him.’
[Ibn Hibban, Darimi 3283/A, Abu Yala, Tabarani, Baihaqi & Ibn Mardawaih]
Ma`qil ibn Yasar r.a. relates that the Messenger of Allah saw said, "Ya Sin is the heart of the Qur’an. No one reads it intending thereby Allah and the Next Abode except that Allah forgives them. Recite it for your deceasedones.”
[Related by Ahmad, Abu Dawud, Nasa'i (this wording is his), and Hakim, who deemed it rigorously authenticated (sahih)]
Maqil ibn Yasaar Muzani r.a. reported the Holy Prophet saw as saying, "If anyone recites Yaseen for Allah’s pleasure, his past sins will be forgiven; so recite it on those who are dying."
(Baihaqi)
Maqil ibn Yasaar r.a. reports that the Holy Prophet saw has said, "Recite Surah Yaseen on those who are dying."
(Abu Dawood)
Ummud Darda r.a. reports the Noble Prophet saw saying, "Over no person who is about to die and Surah Yaseen is read upon them but Allah Ta’ala lightens the difficulties of death for him."
(Qurtubi)
Anas r.a. reported Rasoolullah saw as saying, "Whoever goes to the graveyard and reads Surah Yaseen Allah Ta’ala gives them (the grave dwellers) ease that day, and the reciter receives spiritual blessings equivalent to the amount of letters of Surah Yaseen."
(Qurtubi)
Abu Hurairah r.a. reports the Messenger of Allah saw saying, "Whoever recites Surah Yaseen on the eve of Friday he will be forgiven by morning."
(Qurtubi)
In other narration, Abu Hurairah r.a. reports the Holy Prophet saw saying, "Whoever recites Surah Yaseen at night he will be forgiven in the morning, and whoever recites that Surah Haameen in which Dukhaan is mentioned he will be forgiven in the morning."
(Abu Ya’la)
Yaha ibn Abi Kathir says, "This narration has reached me that whoever shall recite Yaseen at night, he remains content till morning and whoever shall recite it in the morning, he remains content till evening. And that person who has related this to me has also experienced this."
(Thalabi said, and Ibn Atiyah has mentioned this and Ibn Atiyah says, "Experience confirms this.)
Aisha r.a. reports Rasoolullah saw saying, "Indeed in the Noble Qur’aan there is a Surah, for its reading will intercede and will be a means of forgiveness for its listener. Listen carefully, it is Surah Yaseen, in the Torah it is called Muimmah."
It was enquired, "O’ Messenger of Allah, what is Muimmah?"
Rasoolullah saw replied, "It contains for its reader the benefits of this world, it removes from him the dread of the next life, and it is called Dafiah and Qadhiyah."
Again it was enquired, "How is this Surah Dafiah and Qadhiyah?"
Rasoolullah saw replied, "It takes away from its reader all afflictions and fulfills his need. Whoever recites it, it will be made equal to twenty pilgrimages. Whoever shall listen to it, it will be as thousand dinars, which he has given as charity in the path of Allah. And whoever shall write it and then drink it, it will enter into his heart a thousand cures, a thousand radiant lights, a thousand times more increase in belief, a thousand mercies, a thousand blessings, a thousand times more increase in guidance, and will remove from him all gall and disease."
(Al-Tha’labi, Hakeem Tirmizi in Nawadrul Usoos)
Imam Ghazali explained that this is because soundness of faith rests on acknowledging Resurrection and Judgment, and Surat Ya Sin details this in the most emphatic of ways. Imam Fakhr al-Din al-Razi concurred.
Imam Tibi explained in his commentary on Mishkat al-Masabih that Surat Ya Sin was called ‘the Heart of the Qur ‘an ‘ because of what it contains of overwhelming proofs, decisive signs, subtle spiritual meanings, eloquent admonition, and stern warnings.
Sources:
http://www.inter-islam.org/Quran/surah.htm
http://baraka.wordpress.com/2006/08/10/the-benefits-of-yasin-al-waqiah-and-al-mulk/