DEVONThink Is Good
I’ve been playing around with DEVONthink Pro (DTP) for a while. I got the free download, noodled with it, and wasn’t convinced it was what I needed. I waffled back and forth about buying it or not, but then I took the plunge. I won’t bore you with the details, but this app is awesome. More encomiums can be found here and here and here.
The bottom line: if you need to manage a lot of information, I think this is a very good tool. What everyone says about the app is true: it will take a while to get used to. But then—look out. Buy it here. Well worth the money, from what I can see.