Moo is an online printing service that now lets you turn your Flickr photos into small business cards. After logging in to your Flickr account, there’s a nice drag, drop and crop interface. The end result are thick, glossy cards that are long and narrow and about half the size of regular cards. The company will send you 100 of them for $20 and Flickr Pro users get 10 extra cards for free.

The site is getting heavy traffic today from BoingBoing and PlasticBag, so you may want to put it on the old calendar or jump over to FutureMe and send yourself and email to look at it later in the week. Apparently all the cool kids will have Moo cards by the end of the week.

This is a great value add via the Flickr API. More than a passing fad, Moo received $5 million in series A funding in April from The Accelerator Group, Atlas and Index Ventures. The nine person company was founded by Richard Moross of London.

If printing your photos in interesting ways is of interest, see also our review of Tabblo last week.