I just read a great post by Lorelle Van Fossen on ProBlogger.com. It is actually an excerpt from her book, that I might have to see if I can find. 
She talks about something I have been working on lately, after reading many posts here about how it is important to not only get keywords in your title, but keep your posts focused on the niche you are blogging about. In my case it is vacation homes in the ski resort towns of Colorado. I write (on my other blog mostly) about the lifestyle and recreational opportunities as well as the market conditions and the area.
The following paragraph summarized her post for me, and maybe it was because it hit home:
"Your Blog's Content Labels Your Blog
If your blog tells more stories about your life than reports on the news and world around you, then it's a personal journal or memoir. If your blog reports and comments on politics, it's a political blog. If it has more reviews of products and services than other content, it's a review blog. If it has more photographs than text, it's a photoblog. If it has more music than text and pictures, then it's a music blog. If it has more video than music, text, and pictures, then it's a video blog, vid-blog or v-blog. If your blog has more ads than content, it's in the business of blogging."
She goes on to say that "The majority of the content on your blog indicates the purpose of your blog. When labeling your blog, take a serious look at its content. As your blog evolves, the value of your blog comes from the content you build over time."
The part about "over time" makes me realize that I can direct it however I want. If I have too many lifestyle posts now, I can shift that direction slightly by posting more real estate related posts and fewer lifestyle posts in the future. My categories that I tag my posts with are really my bookends, and anything falling outside the categories shouldn't be in there anyway (assuming my cateories are well thought out ahead of time).
I subscribe to http://www.problogger.com/ and they often have good posts. Thanks Problogger and Lorelle on Wordpress for this one.
I have both Lorelle's blog and Problogger on my reader. Great stuff.