I was very disappointed that RIM didnt include a file browser with the PlayBook so I went out and purchased all the third party file browsers from App World. Here is a summary:
AIR browser: Lacks many functionality like sort, search, thumbnails and the UI is black and white. Still OK since its free.
File Browser: Best one so far. Lowest price and has a lot of features. Fast, easy to use, has password protection, FTP, zip/unzip. Updates very often (developer said on crackberry forum that they are working on network browsing!!).
My File Manager: Simple look which is good but is slow and crashes a lot when you have a lot of photos - it crashes all other applications open at the time. NOT good.
File Manager: Slow, expensive and not as many features.
File Commander: Hard to use, expensive, not as many features and really small text (hard to see)
File Explorer: Hard to select files, small font size, slow loading folders. Has the basic features and looks good.
Clear winner: File Browser by Aftab. All the other apps are lame comparing to this one. The price is good, and it allows you to access your blackberry phone SD card. As a geek, I was happy to be able to get a look at the whole QNX file system (YAY). It also has amazing reviews! Can't go wrong with this app.
I am going to uninstall all the other crappy file managers and only use File Browser.
Post any questions you guys have here.