Did the fonts change or was it just me.
No, I see it as well. It may be related to the site having gone down for a brief period some hours ago.
If so, I don't 100% like it.
I 100% do not like it, partly because the lower-case o and a zer0 look exactly the same* and partly because the text seems to be more variable-width than before -- quoted text and links to quoted posts are particularly small and difficult to read. Further, the numbers are variable-
height, which I do not believe has ever been the case and is most noticeable when the 8 sticks up above all the others.
I have what appears to be a 1280 x 1024 Dell monitor set to 1152 x 864, with my browser window maximized and the size ratio of this site at the default, so my viewpoint is not small by any means.
(* The word "zero" in that sentence uses a zero. Spellcheck can tell, but could you?)