If you need a great online recruiting tool, or some great writing to get you back into the reenacting groove, then Our Hearts Were Touched With Fire is a great site to look refer to. It's not a group site, but rather, it's a personal site that has a bit of a romantic flare to it. Unfortunately, this site hasn't been updated in some time, so you need to bear that in mind when going through the pages.
The couple that put the site together look at Civil War reenacting from their perspective, rather than the perspective of a group. It's not a blog, although the concept is ideally suited to a blog format, the site also addresses the hobby in general, including answering the "why?" of becoming a reenactor. There's some nice material that would do a new recruit good to look at. One of the best features of this site is the product review section, which in itself is worth surfing this site.