How many times have you run into a problem that other people have already run into, solved, and then blogged about it? Now how many times have you not found the solution online, solved it, but did not share your trials and tribulations with the community? Blogging about your technical feats, no matter how small may help someone later on. Furthermore, you may run into the same problem later on but lack documentation on how you previously solved it. Even if others have blogged about the solution you've come up with, blog about it anyway. Giving multiple view points helps others comprehend the material. I know it helps me and it gives me a feeling of joy knowing that I've contributed back to the community.