And still no client-side encryption?
That, to me, is the biggest problem - DropBox keeps unencrypted copies of your files on its servers.
Sure, you can do your own encryption before uploading or use TrueCrypt containers, but this is not very seemless and can be ridiculous if only one bit changed in a container/file. SpiderOak and others have the encryption done client-side so our NSA will need to come knocking on *your* door instead of DropBox's.
Have they started allowing any folder to be DropBox-able? Or is it still the one-folder-per-machine? (Junction/mount points don't work in many cases.)