Why does my iPhone have so little storage left?

Please help
I have an 8 GB iPhone 4. I know 2 GB are automatically used so I have 6 GB available.
Here's what is on my phone:
Eight apps which equal 485.3 MB (I added from usage)
No music or videos (I use my iPod for that)- 0 MB
No pictures and my photo stream is turned off yet it still says 180 MB
iCloud backup-131.3 MB

All of that together is 796.6 MB which is not even 1 GB. However on my iPhone settings it says I have used 5.9 GB and only have 464 MB available? Help? (I also only have 2 short conversations in my messages and my history is usually clear or empty)

You may free up some space read this:
http://appletoolbox.com/2013/06/cannot-download-there-is-not-enough-available-storage-to-download-these-items/

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