I logged in to my Google Voice account today around 10pm and I noticed this new icon/banner in the lower left side of my screen:

I promptly clicked (as they hoped I would)

Google is working with iPrint.com to send the first 50,000 people (Google Voice Numbers) a set of 25 business cards.  SWEET!!!

I obviously signed up.

Here are their words (not mine)

Hand out your Google number

In celebration of the relaunch of GrandCentral as Google Voice we are giving away 50,000 sets of 25 Google number cards totally free. Yep, shipping, printing and everything is included. Have a little fun and show off your Google number.

Calling
Personal
Business

How it works:
1) Select one of three styles
2) Add the information you’d like on the card
3) Fill in your shipping and email information (iPrint will use this only for the purposes of confirming and sending you your cards)
4) Your personal Google number cards should come in 10-12 days

(Offer available to U.S. continental street addresses.)

So, as you can see, I got my new cards ordered right away!