New phone - so I check the forums!

I've just moved up -- WAY up, from a Treo 650 that I used like a minicomputer -- to a Captivate. Miss the Treo, but so many sites have abandoned Treo-friendly apps that I needed real web access.

I have immediately downloaded all sorts of apps, but I am used to dealing with the phone at file/folder level...so here I am. First I'll read a lot, and then figure out how to make this phone work as well for me as the Treo did. Don't know about rooting - but I will if that's what it takes. (At this, my kids, both in high-tech related fields, roll their eyes, but they are tethered to BBerries due to company standards, so they're no help.)

Questions will follow in appropriate forum once I've checked out the info already here.
Thanks!