We have rich blogging features that are on par or better than most blog systems: create posts, edit your side bar, set catgories, human-readable (and adjustable) URLs, commenting, comment moderation (open/moderate/closed), close commenting after x days, post in the past, set time zones, post drafts, private drafts, etc.
Even better, a blog doesn't have to be the focus of your site -- it can be just a page. You can create other pages to put things like pictures, videos, photo galleries, slide shows, maps -- by just dragging and dropping them on. You can even create custom forms and surveys by dragging on the form elements (name, address, phone number, drop downs, etc)
While you can't upload PHP, you do have full customizability over your theme CSS and HTML.
To top it off, your site is hosted free of charge on our robust infrastructure that's machine and geographically redundant. We serve sites that hit the front page of Digg or the NYT every day and don't even see a blip in our traffic graphs :)