We were talking about some stuff on the podcast around how co-workers wouldn't care or find it interesting that I run some Web sites in my spare time. Not because it isn't generally something I spend a lot of time talking about, but because in theory everyone in my line of work does something like that.
But the truth is, they don't. In fact, having done this as my primary job function now for around ten years, I can't think of anyone I've worked with that had a side project Web site (not counting blogs) with a high level of traffic or revenue. That seemed strange to me upon that realization, but actually it probably makes sense. My sites came out of having a media background, not a code monkey background. Although oddly enough, the programming career largely came out of the fact that I didn't feel like I could do anything cool from the media angle without the programming knowledge. Weird how that worked out.
I will say though that blogging in the aggregate sense among coders has actually been an enormous benefit to the profession as a whole. I obviously can't read each and every one, but because they're all so well indexed by search engines, they provide a lot of answers when you're looking for them.