1,000 posts - not blogs,
Although I do own quite a few blogs.
I set a date in my diary on a weekly basis and pre-post blog posts - that way I don't have to remember to do it during the week and have been able to establish a weekly posting pattern for the blogs I want updated. My VA blog is 3 times a week, my photoblog is daily, and I have a couple of other blogs that are usually once or twice a week (one on small offices and another is a family blog).
I do have other blogs that relate to books I've written or are holding bays for future books - great way to test content with your audience.
Guest bloggers are a good idea - it helps build up interest in your blog with their own audiences and gives you content when you're low on that.