Use Undawnted's Contact Undawnted form, select Contests / Prizes / Goodie Bag and Contest. Then write in the message section, that you have discovered "Easter Egg Number 22 The Rain" for your prize of the month.
It could be an eBook, free subscription, newsletter mailing list inclusion, or a number of other fun gifts.
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Fine Print: you can only enter "Easter Egg Number 22 The Rain" once. The other Easter Eggs have different name/number combinations, so going 1-7 will do you no good. You actually have to find the other hidden gems on this website.
Good luck!
