Lookwork is a very different beast… it is an RSS reader without the pictures. It does, like FFFFOUND, have image bookmarking functions, although at some point down the line we'd like to move that to Pinterest or maybe just Dropbox. But regardless, I personally think it is fantastic for discovery, please give it a try.
I also set up a tool to export your Ffffound account to http://www.wookmark.com . Note that a paid account ($20/year) is required, so I can keep the lights on. If you want to do this, create a Wookmark account and message me the usernames from both sites. While I'm writing this, my import scripts are working through a Ffffound account with 6000 images. It's a fairly straightforward process. Happy Thursday.
[1]: http://ffffound.com/robots.txt