I doubt I would use QuickOffice, an app that comes already installed on the Streak.
But if you go into it and select "Browse", you can examine the contents of the device's SD card - and you can delete items from there by just holding down an item.
And, you can examine what documents you have on the SD card.
I found it odd that one movie, "Race To Witch Mountain" was listed in "Documents", whilst the others were not. And it is also listed in SC card contents.
If you want to know about "Race To Witch Mountain", it's quite a good movie, but has a lot of night scenes, which does not show off the Streak to best effect.