I've always used Flickr for scans JZ, but I can see where the 200 photo limit gets in your way, especially if you wish to use it to house and show off your collections and such. I only have temporary uses for every image I upload, so it never matters if it falls out of view.
The only other knock I have on Flickr is that if you need to obtain all of your scans over the years (if you've got them saved on various hard drives, or didn't have them backed up anywhere else, etc.) there's no easy way to do that. There's no "download all images" link or anything like that.