There's some nice new features if you edit your posts in HTML. For instance, Blogger now has improved image handling, including image positioning:
"When you add an image from the dialog into your post it will be placed at the insertion point instead of at the top of the post."That saves a lot of cutting and pasting!
Blogger has (at last) also added a decent preview function:
which allows you to view your post as it will appear in your blog and not as a simple text rendering - very nice!
Another nice feature with the preview facility is that you can leave the preview open and just hit F5 or Ctr + F5 to force a page refresh (although it may take a few seconds for the updates to be available to the preview - be patient or save the draft first!).
Other touches include warnings if you haven't closed your tags properly and Blogger also claims to handle lists and tables more effectively than previously (click Post Options at the foot of the post window to select how Blogger manages line breaks).
To take advantage of the new features, you have to enable the advanced option in your Blogger settings. Click on Settings from the tab menu at the top of your Blogger home page and then Basic (if it is not already selected). Scroll down to the Global Settings section and select Updated Editor (Recommended).
Sources & References:
Blogger Help: An Overview of the new post editor