- You can see which other CiteULike users have the same references as you, and with one click you can go and have a good nose around in their library
- There's a handy little button that lets you write a blog about individual items in your library. I'll probably never use that, but it's a nice feature anyway
Out of the three tools investigated here, CiteULike is probably the most light on features, the least flexible and the least snazzy. But perversely it was the one that I found most charming and the one that I would be most likely to keep using.