1) The link back policy. I find this annoying. Sometimes I want to use pictures in a purely illustrative fashion and don't want them to be a pointer off to elsewhere. I have a feeling I shouldn't be so precious about this but it's annoying.
2) I get that free users are a drain on resources, but surely by adding more sets, I wouldn't using any more resources than I already am, right? I get the bandwidth cap and I'm fine with it but the sets one is annoying.
3) Lack of customizability. Not a biggie (and something surprisingly few places have, as well) but I'd like to be able to lay out my page as I want it.
On the other hand, I do like the last-to-first aspect of it. And the uploader - last time I tried it it wasn't up to much but now it's pretty full featured and does all the things I used to wish it would do. If only ScrapBook was capable of doing last-to-first, I'd switch over and use that but no such luck. Within a page, yes, but over a whole album, no, not so much. V annoying.
Hmm. Actually, I might be able to fake it after all. This requires some consideration. I wouldn't have the commenting, etc but on the other hand, I never use that on Flickr anyway - I've never really engaged with the Flickr community. I guess I'm just not into my picture taking enough. Hmm. Thoughtful thoughts must ensue. Because I need a new LJ project, oh yes I do.