I have nine, but they’re broken down into very specific categories. For example, I have Newsgirl Tells the World! for collecting links and offering opinions on all the hot topics of the day and then I have The Language Log for news specifically about language, literature, and literacy. I have The Creepy Reading Corner for horror novel reviews but then if they’re about demons I send the reviews over to Deon Love (which hasn’t been particularly active yet). While I have zero organization in my “real life”, I like my blogs being well-categorized.
Right now, I have three. But I only regularly contribute to one. The other two are just for when I get some great inspiration or if I find a really good recipe to share.