I cut out the file card and the UPC (you never know) and trash the rest. Sometimes I might cut out one of the "up coming figure" pictures on the back to use as a poster, but thats very rare.

I keep every file card I can get my hands on, and I buy ALOT of multiples... like I said before, I have 50ish Troopers, 30 Vipers, 10 Python Troopers (painted all black as seen in Dio) and a whole bunch more... I rarely army-build the joes, but I do sometimes so I can make customs (like the Outrider figure).