Where does junk gather on your SD card?

[iLiKePaNkAcKeS]

Hey, i have a droid with a 16 GB SD card.

Now i just took off all my music and notice that i still have 5 gigs of used data. Now i know for a fact i dont have 5 gigs of stuff i use on that card and i've checked folders with Astro for junk but cant find anything!

Where does junk gather on your phone? Where should i try looking?

Thanks