A long time favourite has, of course, been Moleskine. I've only ever had one of their notebooks before, one of the City ones but I think that I might have to get another one after seeing this 2010 dairy of theirs. It is a day a page dairy and as we know they cans be quite bulky and hard to carry around, so Moleskine have thoughtfully split it into 12 little notebooks but with a hard cover to keep them in when not on that month. I think I'm in love.
Another brand that I am fast falling for is O-Check. they have some pretty adorable designs.
And I have got to stop talking about notebooks because I get payed today and I might just be tempted to blow a large chunk of it on them.
Not all of them are notebooks per se but they are all papergoods so I think they count.