It's easy - just select the desired access level, copy this link and send it via email, instant message, etc.Link: Just a link to your wiki. Post this anywhere and people can ask you for the invite key.
Integration with other services
Integration with popular blogging software (WordPress, LiveJournal, etc) along with auto-posting each public note to a specified 'blog. - Tim Dub
Digg buttons for posts. It would be a quick way to see the hottest posts amongst your friends. - textnotspeech
Sync or at least import/export/subscribe/publish functionality with del.icio.us, so I don't have to duplicate efforts charlie c.
"Import gmail contacts" searches only for first 50 - that doesn't even get me out of the "A"'s! - Catherine Devlin
Optional integration with Digg, i.e. a mouse-over of the Digg profile icon would show stats and user-name on a small pop-up , as well as functioning as a link. - Ash Laws
Auto-posting to Pownce from RSS/Atom feeds. To prevent blatant plagiarism, require a user to "claim" a feed in the same manner as Odeo or Technorati. Again, Pownce should be able to recognize if the feed item has a link or an enclosure tag with an attached file. - Tim Dub