This is a very simple firefox (though it should work in chrome without any drama) addon I hacked together in an hour while procrastinating from homework. I don't care for the default firefox newtab page and enjoy XKCD but rarely think to actually visit it. Two birds with one stone or something to that effect.
You can view the addon and get it here. I just need to make a couple of small changes to get it approved for chrome and I'll be doing that "at some point"
Feature requests are likely to mostly be ignored.