Cheezburger, Seattle’s oddball network of comedy Web sites, already does a pretty healthy business selling T-shirts, plush toys and calendars.

Now, the company that revolutionized cat photography with silly captions is rolling out a new line of holiday greeting cards. Working in partnership with The Madison Park Group, the Christmas card collection includes 16 dog and cat photos from the the company’s Web sites. The holiday greeting cards will be available on Cheezburger’s Web site beginning in November as well as at select retail outlets across the country.

Unfortunately, at this point, there’s no plan to offer holiday cards from the company’s other popular Web site: Fail Blog. (Even though there are plenty of great possibilities).

However, it is good to know that a portion of the sales from the greeting cards do go to pet shelter and rescue organizations.

And, if you can’t wait for the holidays to get your Cheezburger greeting card fix, the company is already offering a boxed-card set for Halloween.

Cheezburger, which raised $30 million from Foundry Group, Madrona Venture Group and others earlier this year, operates about 50 different comedy Web sites. The profitable company, led by Ben and Emily Huh, attracts more than 19 million visitors per month.

UPDATE: Ben Huh tells The Wall Street Journal that merchandise sales are an important part of the Cheezburger empire, with more than 100,000 T-shirts sold to date. Huh also notes that the company’s page view total has jumped to 500 million per month.

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