Normally I wouldn't think too deeply about something like this but lets all take a time machine back to August when digg sent a cease and desist order to DiggGames. Kevin Rose wrote about it on the Digg blog, but that was specific to the term 'digg'. With new teminology such as 'dugg' added, could duggtrends/duggmirror be in jeopardy? Hopefully not as they provide an awesome service that is widely used throughout the digg community.
"DIGG, DIGG IT, DUGG, DIGG THIS, Digg graphics, logos, designs, page headers,
button icons, scripts, and other service names are the trademarks of Digg Inc."
Update - Sites that have been contacted:
Digg2Phone - " With Digg2Phone, you can choose which stories you want us to follow for you, and we'll text message you when something happens."
Digg Card - "Digg card is a way of inserting your Digg.com Profile on to you website."
DiggGames - now games1.org - a listing of all the flash games that have been featured on the frontpage of digg.com