WebShas is a great site for those interested in Jewish ideas and where their sources are from the Torah & Talmud:
http://www.webshas.org/emunah/gehennom.htmHell - GehennomLinksThe Angel of Hell
Satan and the Angel of Death
Divine Reward and Punishment
The Next World - Olam HaBaGeneral DetailsDetails of the valley known as "The Valley of Ben Hinom" - "Gei ben Hinom": Eruvin 19a; Succah 32b
The openings of Gehennom in the desert, the sea and Jerusalem: Eruvin 19a
The breadth and width of Hell: Pesachim 94a
Hell was created before the Universe: Pesachim 54a; Nedarim 39b
When the "Mouth" of Hell was created: Nedarim 39b
Its fire was created on Day Two of Creation: Pesachim 54a
Better to receive punishment in this world, rather than after death: Pesachim 57b
Those who remain in Hell past 12 months: Rosh HaShanah 17a
Isaac's merit keeping the Jews from Hell: Shabbat 104a
Why Gehennom has the name "Gehennom": Eruvin 19a
Gehennom is also titled "Yam Kol [Sea of All]" because so many go there: R. Shabbat 104a "LiYam Kol"
Gehennom is also known as "Tifteh": Eruvin 19a
Gehennom is also known as "Sheol": Eruvin 19a
Gehennom is also known as "Avadon": Eruvin 19a
Gehennom is also known as "Be'er Shachat": Eruvin 19a
Gehennom is also known as "Bor Shaon": Eruvin 19a
Gehennom is also known as "Tit haYavan": Eruvin 19a
Gehennom is also known as "Tzalmavet": Eruvin 19a
Gehennom is also known as "Eretz haTachtit": Eruvin 19a
Gehennom is also known as "Paku": Megillah 15b
Gehennom is also known as "Raah [Evil]": Nedarim 22a, 40a
Rage causes one to be afflicted by "types of Hell": Nedarim 22a
When Avshalom was hanging, he saw Gehennom open beneath him: Sotah 10b
King David cried out over Avshalom, "My son," eight times; this brought Avshalom out of seven levels of Gehennom, and either caused his head to come back to his body, or brought him into the next world: Sotah 10b
Groups of People in HellPeople who are arrogant: Sotah 4b-5a
When humans punish a wicked person, they have to shut the wicked person's mouth to keep him from slandering them; Gd punishes the wicked in Gehennom, and they admit His justice: Eruvin 19a
Whether the wicked repent at the entrance to Gehennom, or not: Eruvin 19a
The punishment of those who cause others to sin carelessly, with their bodies: Rosh HaShanah 17a [2x]
The Definition of the Above category includes Jews who don't wear Phylacteries: Rosh HaShanah 17a
The Definition of the Above category includes non-Jews who reign with terror, or who cause sexual sin: Rosh HaShanah 17a
The punishment of opponents of Torah: Rosh HaShanah 17a
The punishment of Those who Betray their People: Rosh HaShanah 17a
The punishment of heretics: Rosh HaShanah 17a
The punishment of those who act separately from the community: Rosh HaShanah 17a
The punishment of those leaders who cause others to fear them: Rosh HaShanah 17a
The fate of Yeravam ben Nevat: Rosh HaShanah 17a
The punishment of those who embarrass others: Bava Metzia 58b
The punishment of those who alter others' names, even if the nicknames are common: Bava Metzia 58b
The punishment of adulterous men: Bava Metzia 58b
A person who is adulterous will end up in Gehennom, even if he is a Torah Scholar: Sotah 4b
A person who listens to his wife's advice in certain areas, as King Achav did, will end up in gehennom: Bava Metzia 59a
Anecdotes involving HellKorach's children were saved from descending into Hell: Megillah 14a
When Nevuchadnezzar descended to Hell, the people there thought he had come to rule them, until a Bat Kol [Divine Voice] put him in his place: Shabbat 149b-150a
Avraham saves his descendants from Gehennom, unless they intermarried: Eruvin 19a
Attributes/Acts which prevent entry to HellJews are protected from the fires of Gehennom by their Mitzvot: Eruvin 19a
Humility: Yevamot 102b
Fear of sin: Shabbat 104a
Awe of HaShem: Yevamot 102b
Charity: Gittin 7a
Visiting the Sick: Nedarim 40a
Care in enunciating the words of Shema merits a chilling of Hell: Berachot 15b
Suffering poverty: Eruvin 41b
Suffering intestinal disorders: Eruvin 41b
Suffering from money-lenders: Eruvin 41b [according to Rashi]
Suffering from a harsh government: Eruvin 41b [according to Tosafot]
Suffering from a bad spouse: Eruvin 41b
OtherTitus's attempt to avoid posthumous Divine punishment via cremation and scattering of his ashes - and how the tactic failed: Gittin 56b-57a