"Hark, A Vagrant!" is definitely a comic worth checking out. I wouldn't call it one of my favorites, just because it doesn't have an ongoing story, and I don't tend to be as impressed with gag-a-day strips (even extremely well executed ones) as I am with those that carry on a narrative. But other than that, Beaton's work is pretty damn near perfect; her drawing style is impeccable and full of delicious detail, and her writing leaves me in stitches, even when I have no idea what she's talking about (being not a strong student of history, Canadian or otherwise).
In this way H,aV! is kind of like XKCD, in that I just don't get about 30% of the jokes, but I enjoy the jokes I don't get a bit more in H,aV! just because the art is so lovely. Not that I don't also love XKCD, but there isn't as much to look at, generally speaking, in Munroe's work, whereas Beaton always has something to offer.