I finally decided to switch from Windows Live Sync (aka FolderShare) to DropBox. I’ve got it installed on my desktop, Dell laptop, MacBook, and Acer netbook now, and I’ve moved everything from FolderShare to DropBox.
The main problem with FolderShare is that it doesn’t actually store any of your stuff, it just enables you to sync a folder between shared computers. So, to sync two computers, for instance, you need to have them both turned on and connected to the internet at the same time. For me, this has been leading to occasional problems, where I wind up with two versions of the same file, or I need to turn on my desktop computer to get the latest version of a file down to my laptop, for instance.
DropBox stores your stuff in the cloud, so it shouldn’t be a problem to get a shared file from one computer to another without needing them both on at the same time. We’ll see how it works in practice, but so far, so good.