One of the things I hate the most is a newly launched blog with one or two posts. I like to see a fair bit of content on a blog before going there as it lets me know how consistently a blogger publishes, and thus if it is worthy to bookmark or even subscribe to via RSS.
Over on Blog Beat, there is a post about this analyzing it from the writer’s side.
10 posts is a good bar to set when evaluating your ability to continue to create more content for the site. If you struggle to get to four or five posts how can you expect to continue to create articles month after month? If you can create 10 quality posts in a short amount of time, you most likely have the writing skills and knowledge to carry your blog for months and years.
Check out the site for more reasons to get some initial seed content on your new blog.