It seems like every part in the Sparkfun Eagle library uses the default ‘U$’ prefix. Just out of curiosity, why doesn’t the library use prefixes for its parts? Sure it takes a whole 3 seconds to change the name, but the library would be just that much cooler if all the parts were prefixed, and being cool is, well… cool.
…and (a little off-topic) it would be great if all parts in the SF Eagle library were available in the shop, for example the smd resistors/caps/etc…