The concept of a concept of a commonplace book is rather simple: a collection of useful information. It can be in the form of quotes, recipes, lists, notes, pictures, anything. The info can be self created, or copied, or adapted. The goal is simply to make a personal resource.
Blogs can be a good example of commonplace books, especially the early ones, which were mainly just a collection of links. Other technologies that are now used (beyond a physical notebook) include OneNote and Evernote. The ability to easily sort the information is a vital.
Now, Hubski has a pretty great and unique set-up. The tags, like those on a blog, allow for easy sorting. Hubski as a whole could be taken as a sort of commonplace book.
I was thinking though, that by using a single dedicated tag (#commonplace), a more identified, eloquent, and coherent core of a public, sort of 'open-source' commonplace book could be made. By using associated tags, it would be easy to sort it further, and would create a place to keep useful links and self posts on Hubski. With the amount of users, a solid base of rudimentary info could quickly be created that would serve as a sort of archive for quick reference.
Obviously, Hubski in someway already serves this purpose on both an individual and community level. But it seems to me that an isolated tag could help seperate more discussion based posts and news posts from more information based ones. It could be a good idea to customarily reserve #commonplace to be a community tag added by someone other than the OP.
I'll be using this post as an interest gauge, and if it seems this is a good idea that people like, I'll post some links with more info on commonplace books to help get the ball rolling.