great! I think I show up higher in search results because i'm constantly adding to my blog. and it allows you to put up a lot more pictures of your work (beyond just a 'photos' page which may get cluttered if you post too much)
In my opinion, everything doesn't need to be long, or even that educational. I post a lot of photos with a little bit of education from time to time. And an occasional pop culture reference for fun. Thats about it. I really don't expect very many people to be following my blog religiously. Just another place for potential clients to see recent work, and get to know me a little better (establishing trust)
also, if you post recent work, you can notify the client who's worked you posted. High likelihood they'll show their friends or post it on facebook. somehow it will probably get you some more exposure from that existing client who's already happy with your work and driving around a shiny car.