Yeah, the Beta is in the Pocet PC Software section.
This particular software is for your PPC, so that you can extract and even build .rar files right on your phone. It is a lot like winzip.
You can get the PC version fron Download.com or a place of that nature, I use it more than Winzip, only because it can handle .zip files and Winzip cannot handle .rar files.
I will link you to this when I get home tonight if needed, but it should be pretty easy to find. I think that it is free as of a year or 2 ago as well
Hope this helps.