I originally posted this in August 2011. The sweepstakes did expire earlier this year, but I'm posting it again since a new version of the giveaway is now active. A few details have changed and this re-post reflects the new info. Good luck!
First class mail will increase 1 cent to 46 cents on January 27th, 2013
Postcards will increase 1 cent to 33 cents on the same day
If you have any forever stamps or forever postcards, you will still be able to use them after the price increase date with no problem. But, if you have any stamps or stamped postcards with an amount printed on them, you will need to use a 1-cent makeup stamp with them or your outgoing mail will almost certainly come straight back to you.
Each day I post up one new sweepstakes that you may enter by snail-mailing in an entry. Read the prize description and if you are interested in winning that prize, click on the Continue link at the bottom of the post for instructions on how to enter through the mail. Good luck!