Features of photo sharing services

I've got approaching thousand images on the flickr photo sharing website and have been considering whether I should continue my annual subscription or move to another service. This has led me to consider what features I really want or need enough to pay for, and from there to consider what features of flickr I current use:

1. I upload photos regularly (at least weekly)
2. I use flickr as my primary backup for images: if my computer harddisk dies, all the photos I care about are safe on flickr
3. I spend considerable time tagging my photos, both with tags which apply to entirely batches / sets and with tags which apply to individual photos
4. I use URLs of flickr photos (usually my own) in email or blogging
5. I license all of my uploaded photos under the Creative Commons (with a rare exception or two)
6. I participate minimally in several flickr-based communities, with a mind to building my photographic skills and experience.
7. I divide my photos religiously into sets, to make it easy to locate (and tag) photos, particularly travel photos
8. I use my flickr RSS feed in several places (and in several different RSS formats)
9. I publish almost all of my photos publicly. The only reason some of them are private is because once I see them on the larger screen they're dreadful shots, or because some people don't like their photos being public (two I encounter regularly) and I do my best to accommodate them.
10. Rarely I upload non-photographic images to flickr, but not enough to worry about recent issues

It is a little hard to know which features I might use without actually using a system that offered the features and seeing how they worked, but the features foremost in my mind currently are:

1. Namespaced importing of EXIF tags as flickr tags
2. Native support for geotagging
3. Easier export of tags, especially via RSS/XML
4. Native support for dublin core tagging (Creator, Title, Subject (using tags), ...)
5. The ability to write add flickr tags and descriptions into the image metadata, so when it gets downloaded the metadata associated with it is not lost.
6. The ability for users to deprecate the quality of images: to say that this is a lousy image, but I'm uploading because it's the best I've got of the subject.
7. Support for describing that an image is derived (cropped, balanced, etc.) from another
8. Support for directly linking images as being of the same subject (even if one of the images is by another user)
9. Support for timed release of images: upload ten images and have one "appear" in the photostream every hour for ten hours
10. Support for grouping contacts, I have 800 contacts, and finding for example, contacts I work with, just isn't practical at the moment.

Looking at these the first thing I notice is that, with the exception of the last two, are entirely about metadata. Maybe this is because I'm an RDF geek.

Some of the features I'd like, but are much lower on my list of priorities are:

1. The ability to customise the background and layout of the photo pages.
2. Rule-based sets, since the camera make and model are in the EXIF data in every image and flickr is already reading this data, it would be great to be able to sort them into sets based on this kind of thing
3. Arbitrary boolean searching on tags and text
4. A broader range of image licences, including the GPL and national CC variants

Of course, any site that did offer me all of these features, would probably have to offer me an easy way to migrate my existing images (and their metadata).

Looking at the cameras used by flickr users, which are led by the entry-level digital SLR cameras, I'm guessing that most of flickr users are fairly serious about their photography, but I've got no real feel for what their priorities are. I suspect that those from a visual media / photography background see the customisation of background and layout as significantly more important than I do. There's a list of features, on which many users have voted,

One feature set that is entirely absent from my list is privacy. Maybe because I don't upload pictures of children or naked people, I feel little or no interest in this. The only reason I hide the photos that I do hide is because it's requires two fewer clicks than deleting them.

So, what image sharing sites do you use, and what are your important features?