Don't know how other Librarys worked in older Posers, but I really like the current one in PP2010.

I got used to it pretty quickly and it doesn'T bother me, that it isn't dock-able. So it's not taking away precious preview window space. =)

You just have it in the background, and once needed you call it back from there via the task bar. I really do like it this way.

 

But I imagine, that when you had a different workflow for so many years ... old habits die hard.