There are many restrictions to using the logo. These restrictions are laid out in detail in the certification packet you will receive shortly

from Sun.
I think they will allow you to put the logo on a
personal calling card but not on a business card. And you are not allowed to change any of the colors of the logo or separate the text from the graphic. You are not allowed to make it a prominent feature on the card either. There is also a restriction that does not allow the logo to be included in your resume. You are, however, free to state that you are a "Sun Certified Programmer for the Java™ 2 Platform".
Basically, with all the restrictions Sun puts on the use of the logo, the only thing you can really do is go to the website and admire it
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Junilu Lacar
Sun Certified Programmer for the Java� 2 Platform