Hey... Very possibly a stupid question here, but... If I want to add a blog to a currently existing website (written in Hoplon), could I use Jekyll and how would that work?

Jekyll produces static html files right? You could link to those pages with some hoplon/boot clj to grab the filenames and put them into (a) elements. Or you could parse the jekyll output for html to put into :html attribute on hoplon elements. Probably other ways too