If I visit my blog with a "clean" browser - after clearing the cookies and history - the latest entry on my blog is dated 3 Jan 09. In fact, I've posted several entries since them.
The only odd thing I've noticed is that the 3 Jan entry is numbered 441. The 2 entries posted since then are numbered 466 and 470. I don't know why the numbering is so radically non-sequential.
If I visit the WP login page and return to the blog home page, all the missing entries appear. If I revisit without clearing the cookies, the missing entries remain visible.
If I clear cookies, the newer entries disappear again.
If I use external links to visit the new blog entries, I can read the entries, but it doesn't make them visible. In fact, they won't even appear in the Jan 2009 archive unless I visit the login page first.
The blog is at http://www.cryptosmith.com - feel free to try it yourself!