There are a lot of places where you can submit blog posts other than Digg and Reddit -- because they aren't as big as the "big guys" you'll usually do much better.
StumbleUpon is amazing for everything - you just have to connect with other users. Can be used *as* a blog.
FanPop is a good overall site - but not a lot of people
List of several sites:
TimeThief in particular might like hugg.com since it is for enviro stuff.
here's one for video game development related posts: