Here are two livejournal etsy communities:
ShopEtsy, where you can promote your shop and browse other etsy shops
etsypicks, where people post photos of things they bought at etsy
Here is an etsy yahoo group, sister group to LJ shopetsy.
I have met some etsy & non etsy friends through my blog at Lj. I have also found some great shops, and get extra traffic through it. It's fun, and worth a shot if you're just thinking about doing it. I think alot of people worry about starting a blog, because they think they need to be interesting or poetic, but just be yourself. Even easier is keeping the blog related to your crafts and etsy shop.