If you're ever had the pleasure of reading xkcd, you know it's utterly hilarious. I read it, most of my friends read it, so it lends itself to coming up in conversation time to time. It's nerd comedic gold, and let's be honest here: you're on an Android website, so it's right up your alley. To ensure you're never without your appropriate dose of vitamin xkcd, I recommend xkcd Viewer.
xkcd Viewer is a free, ad-free app that lets you read any of the comics listed on the main website. There's no delay between new comics going live on the website and them being accessible on your phone's app, so if you're ever out and about and want to pepper your experiences with some funny, xkcd Viewer will do the job.
The app is fairly simple: it defaults to the latest comic. Tapping on the comic gives you whatever the mouseover text is on the website. You can favorite the comic, move sequentially forward or backward, or tap the dice button to jump to a random comic. You can also bring up the menu by tapping your menu button on your phone. Doing so opens up more options like seeing the entire xkcd master list, if you're inclined to scroll up and down it.
That's pretty much all there is to it, but if you hadn't started downloading by the end of the first paragraph, get to it. If you don't, expect a visit from the black hat man.
Download links and more pictures are after the break.