gdata

I wandered if I could use blogger from my own site. It looks like that will be no problem. I can do some neat stuff with

http://www.blogger.com/feeds/blogID/posts/default

Like Min-max date ranges, tags, and other sorting techniques to fine the post you are looking for. That won't require gdata. If you do authenticate with gdata you get modifying posts and create new posts as simple XML POST data.