Bookworm

This mod allows you to mark books as read by right clicking on them, either in your inventory or while reading them. A menu will allow you to mark or unmark them as read, by adding [Read] to the start or at the end of the book's name, according to your settings.
[Read] The Lusty Argonian Maid or The Lusty Argonian Maid [Read]

You can also turn on the marking of Skill Books, by adding the [Taught Skill] as suffix.
The Lusty Argonian Maid [Blade]

Lastly, this mod allows you to pick up Skill Books without reading them, saving them for later.
Both, the marking of taught skills and the pickup option will be disabled for a book once you've read it and learned the skill..

This works with all books, vanilla and mod added. The only exception is the pickup option for scripted & quest object skill books, like the Mythic Dawn Commentaries. Those will not give the option to pick them up, since they usually need to be read for quest progress.

Both features of this mod were a wish I had for a long time.
I like reading ingame books, but searching for new ones when you've read all the titles a million times is a bit tiresome. With this mod, I sometimes sit at an inn, read a few books, mark them as read and then go to sleep.
I also admit to wrinkling my nose if I open a book, get a skill up and don't need it this level - especially if it's a skill like Heavy Armor and I already have my +5 on Endurance. No more! I can now hoard my skill ups like a crazy chipmunk and forget to use them until my skill level is 100.