ADRIANBOLT  Backpack is easy to use and PackRat makes it even better: a superb job of replicating the features on your Mac so you save time. And the developer is very quick to reply to emails. Highly recommended.  
(Version 1.6.2)

PAULSRANDALL  PackRat appears to be for Intel, only. I have version 1.6 on OS X 10.4.11 on a PowerPC and it works fine. This version (1.6.2) crashes because the Growl-WithInstaller Framework is found, but for the wrong architecture. This is according to CrashReporter.  
(Version 1.6.2)

CHARTIER  At first PackRat seemed to be a strange app, because it's an *app* made for working with Backpack, a web service. But once I tinkered with it, got used to how much faster it is than waiting for the web and how it brings a few features to the table that even Backpack itself doesn't have, and I saw the light. Toss in the ability to keep all my vital Backpack stuff offline and accessible at all times, and I was in love.

No matter how you use Backpack, even if you have just a couple pages of information, PackRat is a killer tool for working even faster with your account. If you're like me and you have nearly 18 pages, PackRat could very well become a mandatory tool for working with all that stuff. I highly recommend it.  
(Version 1.1.2)

RODNEY SANCHES  Great app - would like to have "Writeboards" integrated too if possible  
(Version 1.0)