I have one, and the average (avi,mp4,dvdrip) files for movies are around 700mb.. And there's a 1000mb to the gb so around 20-25 but there's hames and other files wich take a lot of the 16gb up.
A 16GB ipod can hold 3,600 songs
It can hold up to 80 hours of video so I would say about 40 movies assuming all movies are around 2 hours long
8
8,000
Well checking the amazon page for the kindle fire, it can hold up to 6,000 books. That's 8Gb (6GB of actual space). You can also hold 80 apps, plus 10 movies or 800 songs. Hope that answers your question.
About 4000 songs
The FAQ section for the Kobo Arc says the 16gb Kobo can hold 14,000 books
around 50.
About 20,000
About 7000000
An 16Gb iPad can hold up to 199 app and 1 video and like 580 photo