Books Recorded As Myself:
An Accounting of the Scrolls
Children of the Sky
Goodnight Mundas (a bedtime story)
King Olaf's Verse (by the Bard Svaknir)
Last King of the Ayleids
Night Falls on Sentinel
Olaf and the Dragon
Reality and Other Falsehoods
Souls, Black and White
Spirit of Nirn
The Betrayed (DG, Forgotten Vale book quest, Vol. 1)
The Nereid's Dilemma
The Rise and Fall of the Blades (Youtube video!)
The Lusty Argonian Maid, Vol. 1 and 2 (by request!)
The Tale of Dro-Zira

Recorded as Zorya the Gypsy, Nord Accent, Storyteller Voice:
Of Fjori and Holgeir (Youtube video!)
The Firmament
King Olaf's Verse (by the Bard Svaknir)

Recorded as Valyen, English accent, soft voice:
The Nereid's Dilemma
The Red Book of Riddles
The Yellow Book of Riddles

Notes Recorded (in various voices according to author):

Thieves Guild Related:
A Warning - Vex to Delvin
Give Me A Chance - Delven to Vex
Goldenglow
East Empire Connection
Scoundrel's Folly: Gulum-Ei's Confession
Darkness Returns: Anders's Message
Bandit Notes (Rigel and her father) (3)

Dark Brotherhood Related:
Amaund Motierre's Seal Letter

Riften Notes:
Indaryn's Employee Notices (3)
Note on Sibbi from Maven
Compelling Tribute - Maven to Anuriel

Markarth:
Book of Love Letters (2)

Riverwood Notes:
Riverwood Fake Letters (2)

Miscellanous Quests:
Forbidden Legend Notes (5)