Michael, speaking as a professional blogger, the idea that you could post too often is pretty much absurd.
NYC Resistor's blog should be our model: http://www.nycresistor.com/
Pumping Station: One's is great too: http://pumpingstationone.org/
Yeah, I've noticed a general lack of interesting posts on the blog. I wish I could take over the blog and run it, but I'm too busy and too poor for non-paying work, sorry guys.
My suggestions for breathing more life in the blog:
1) There should be a board-level PR person who is in charge of the blog. They could also run the Facebook page, Twitter, etc. Maybe even start harassing local papers with story ideas to get our name out there. Send post suggestions to the big DIY sites. Send out announcements on the mailing list.
2) Post every event that happens in the space including meetings and classes. Cool photos in every post.
3) We need to organize more collaborative events like the clothesline races. All-night hackathons, fundraising parties, contests, group projects. In other words, generate news so there is stuff to put on the blog.
4) When someone completes a really cool project like Mike's bathroom noisemaker, we should definitely post it. (Also, we need to keep an updated list of projects on the Wiki.)
5) And yes, someone sawing a table leg might not seem all that exciting, but you can sex it up. For instance, I'd love to see a post consisting of a video where someone goes around and asks every member present on a Wednesday night what they're working on.
Hope this is helpful...