Swedish novels (especially Pippi Långstrump)?
Does anyone know where I can find the Pippi Långstrump books online? As in the whole series.
Are there also any other good Swedish books (preferably slightly lower-medium levelled) that I can find online? They can be versions of English books too, I don't mind.
You could try the Moomins (Mumintroll in Swedish) books. I wouldn't know where to find them for free online, but they're probably at the level you want.
+1 for Moomintroll! Also while you're reading Pippi, Ronia the Robber's Daughter is one of my favorites by Astrid Lindgren.
I think bokus.com is what you're after. I pulled a URL for you — these are all their "Children Teens" titles in Swedish in e-book format. http://www.bokus.com/cgi-bin/product_search.cgi?browsing=subjectslanguage=Svenskasubject=1binding_normalized=ebok
ETA: I would be wary of translated texts, especially the cheap ones — stick to things written in Swedish, or translated by reputable sources. Otherwise you're likely to get stuck slogging through some awful translations of public-domain works.