Regular readers may recall that last summer, during 23 Things Cambridge, I auditioned Zotero and Mendely for my regular bibliography-compiling, reference management needs.
Over the last year I've come to favour Zotero. I like the Firefox add-on - it means that the reference organising happens, in the main, right where I'm finding articles: online. I've found recently that you can now also add Zotero library items online, which is a real boon! The synching works a treat, and so does having nested folders to keep my library tidy.
That really is all I have to say about it, I think. It works, it's dead handy, it makes life easier.