If you are looking for one place to get all your PS3 themes, PSU.com now has launched a user driven PS3 Theme secton. Right now there are close to 60 themes, but PSU has allowed users to upload there very own, making it easy to find all the latest PS3 themes.
Also, instead of having to work around .zip files, all files are .p3t and can be directly downloaded to the PS3 when visiting the site via PS3 internet browser.
Update
Upload your themes here:
http://www.psu.com/uploadtheme.php
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