For developer-unlocked phones: simply grab the latest XAP file and deploy it. More instructions in this post.
Getting the app from the Store: It is on invite-only. Send me your Windows Phone's Live ID E-mail Address in a private message. I will come back to you with instructions.
(Because of the amount of requests I receive, I invite users to the beta once per month. You will therefore receive a confirmation within a month. Thank you for your patience.)
Wherigo Foundation: Windows Phone Player development thread
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