Carl Clayton at Sinto has created a page for library and information workers to request invites.
I assume each person gets 8 invites they can pass onto friends, and it seems worth organising, so as not to waste invites on people who already got in, or who don't want to play, etc.
Currently, one of my sub-personalities got invited, so he will probably keep his invites for creative friends scattered world-wide. :-)
If my 'real self' also gets an invite (different Gmail accounts) then I may have some to share with library folks. But don't hold yer breath!