Theoretically, if you have the dropbox account set up to hold your photos, documents/pdf's, and even music if you wanted (or use the awesome Google Music or other streaming service for your entire collection), what will be going into our 9gigs of physcial storage anyway? I'm trying to figure that out. 2GB will be dedicated to my apps, which is perfectly fine (I'm only using 1GB on my atrix, even). So what's left that has to go to the 9GB storage remaining? When you take HD video with your phone, would it also sync to dropbox? If not, that would fill up the 9 gigs fast, but still...otherwise, I can't even think - in this hypothetical situation where the user fullly utilizes dropbox for everything he can as well as streaming music apps - what the 9 GB would be filled up with.
edit: By the way, if you already have a dropbox account, is it going to be combined with the one I already have? Or is HTC's dropbox account going to make me create a new username/pw credentials to access my 25GB free? I was thinking it'd be nice to just use the one I already have and use, and then when the 2 yrs of free storage pass by, if I still have the phone, maybe my amount of storage space would just magically go back down?