Please note that within this document, the term "Onayn" refers to one a mourner whose relative is not yet buried. This is only a working definition, but that the actual paramaters of this stage are subject to debate by the commentators.
The first night, whether one is considered a regular Mourner or an Onayn: Rosh Berachot 2:15
Whether aninut at night is a Rabbinic or Biblical Institution: Berachot 16b
Distinction between where the corpse is/isn't before the mourner: Berachot 17b-18a
An Onayn on Shabbat: Berachot 18a, Moed Katan 23b
Celebrating Shabbat: Berachot 18a Eating from Temple Offerings: Pesachim 38b
Being part of a group for the Pesach Offering: Pesachim 92b, 98a
Eating Terumah: Pesachim 36b
Eating The Secondary Tithe: Pesachim 36a, 36b
Eating The First Fruits: Pesachim 36b
Marrying, when the groom's father or bride's mother died that day: Ketuvot 3b-4a
Making a Blessing on Eating for others, or having it made for them: Berachot 17b-18a, Moed Katan 23b
Making a Group Blessing after Eating for others: Berachot 17b-18a, Moed Katan 23b
For Reciting Shema and The Amidah: Berachot 17b-18a, 19a; Moed Katan 23b
What an Onayn says while other are reciting the Amidah: Berachot 19a
For Phylacteries: Berachot 17b; Moed Katan 15a, 23b
For General Mitzvot: Berachot 17b; Moed Katan 23b; Succah 25a, 25b
