At Goodreads you cannot follow books: Who rates the good books and what else do they read? This service sends you an email with the latest ratings for selected books.
You need to find a specific Unicode character? With Shapecatcher.com you can search through a database of characters by simply drawing your character into a box. It can find the most similar character shapes for your drawing.
The quickfix feature is nice, but it doesn’t give enough context around the search term that leads to use ag from terminal and switch back and forth between programs. I do this search dance every day and I’ve had it! There must be better way!