The Some Bits weblog is over 10 years old now, my first posts were in October 2001. The topics haven't changed much: that first month was a random mix of technical content, tech news, cultural commentary, politics, and Victorian urinals. The format has changed, I used to write more short single link posts. Activity level has varied; here's a calendar view of posts, one box per day.
My weblog is an old school blog, a public diary of things that personally interest me. I mostly write as a way to summarize what I'm learning about something new like living in Paris or flying airplanes. Sometimes I post to influence others with an opinion about Klout or Facebook or SOAP or the like. On rare occasions I troll. But even though this blog is mostly written to satisfy myself, I do write it for an audience. It takes me most of an hour to write these short messages. (See my secret work blog and defunct game blog for much less edited stuff.)
I love the old school blog format. I've got a big list of RSS feeds for other blogs like mine; some recently active favorites include Justin Watt, Jason Kottke, and Rafe Colburn. The list is much longer with less active people Mike Migurski or Andy Baio; I love it when a blog post pops up after six months of silence. I regret that "blogging" for most of the world now means crappy journalism; pro-blogs with 20+ posts a day salted with ad targeting keywords is tiresome.
The ease of Twitter's short format has definitely sucked some of the energy out of personal blogging. But as Anil says, if you didn't blog it, it didn't happen. Go ahead, write something, it's not hard! Even if no one but yourself ever reads it it's worth your time. For hosted blogs these days I like WordPress.com. I keep meaning to check back on how Blogger is doing, too.