As far as I’m aware, you can’t have many “blog” pages, but you can do category pages. Like..if you want have posts about an ipod, make a category for “ipod” or “electronics” and then if you post about something else related, just pick the “electronics” category.
This will put all the blog posts listed under that category…then this category can be put on your “menu”
See for example: http://apocalypticthoughts.com/topics/media/ (no i’m not advertising my page..just using it as an example).
This is a category on my website that I can check off on..then I stuck that onto my menu and if you click on it, it shows these posts.