I like Flickr's image comments, the site is much more pleasant to navigate than ScrapBook, and it's much better for just image viewing as people who want a larger size by 640x480 don't have to endure the eight-megapixel horror that is the full resolution of my new camera. Flickr also has usable upload clients, which Scrapbook still hasn't generated.
However, I'm years away from the 10GB limit of Scrapbook's hosting- the limit for those of us with Permanent accounts, anyway. Flickr would cost me an extra $25 (or $23.995, if I go alternate years; worthless savings, it's only $0.60 given the interest I'd collect on having the $25 in my bank account instead) per year, and I'm not sure if I should make the switch, since I already have a stable image dump.
I'm honestly leaning towards Flickr, especially as the resolution of my camera's gone up again, but I'd like more opinions.
Should I get a Pro Account with Flickr and use it for photo hosting, or should I keep using LiveJournal ScrapBook?
Move to Flickr.
Just stick to ScrapBook.