Glen Allsopp (my blogging guide) says: "I always try and pick something 'brandable'. If it's relevant to the niche that's great, but it doesn't have to be. Ideally, the fewer the words the better. It helps people remember the site." A popular keyword phrase in your industry or niche might work perfectly as your blog name, and you may strike lucky and find the related domain hasn't been purchased. The domain name I have chosen is not immediately obvious to the niche I've decided on, but it is a single word that has been manipulated, and is very memorable. At least, I'm hoping so. To research your possibilities, Glen recommends using the Google keyword Tool and the free Wordtracker keyword tool, and inputting the kinds of search terms you may use yourself in looking for sites related to your niche (for example, "brick laying" if your blog is about building). The results may give you name ideas.