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.
Great little gadgets using the very latest Web2.0 technology to bring web pages to life. Because this page is a little more awkward to edit, would you mind* adding your comments or whatever on Labpixies by clicking Labpixies2 instead. Thanks.
*unless, of course, you know what you've doing and can fix it if it goes wrong - but I suppose that's the nice thing about wikis, the previous versions are still around.