Usually, when people ask me about the benefits of blogging - I usually don't know what to focus on. There are many areas where blogging adds value.
Now I just have to direct them to this post by Lilia. This bit, particularly, resonated with me deeply:
However, the real value is not at the post level - ecosystems between blog posts are more interesting and more important. Think of the fuzzy feeling of knowing someone from reading a weblog over time, implicit understanding of a new issue that emerges while following a conversation between bloggers or sense of belonging to a network of others - in all cases posts and links are only a tip of the iceberg. Counting and measuring those visible traces is tempting, but knowledge, reputation, relations are likely to escape rankings.And Lilia is not someone who merely blogs. Her PhD research was around blogging. Check here for her highlights from Microsoft employee blogging study and her posts on the choices between personal and business dimensions of blogging : Blog posts 1, 2, 3 + ECSCW'07 talk