This is a very good point. Consistency should be maintained. I think a couple of posts a week are easily achievable and that's not too inconsistent. Whatcha think?
Yeah, I personally feel that consistency is the key. I comment on one blog where the timings are all over the place... sometimes I'll have to wait 2 weeks for them to post, sometimes two days, sometimes a week, you get the idea. As a result I stopped checking back and only go on there if he tweets about it.
No, we're still fetching the content for the human.
Yeah, I suppose the more traffic/the more established your site is, the less it matters as you'll still be getting plenty of social bookmarking and search engine traffic. Look at Rauru... he didn't post for about a month and his blog actually got MORE successful!