The Posting Option Panels supports posting both to the groups and at your site.Below is the posting panel
Lets take a look at the Blog Posting Options and the combinations of permissions which is really interesting.
Blog Editor is a rich text editor plus it can insert attachments, polls and pictures from your computer, a multiply album or from web. Easy clickable tags so that you don't have to remember the tags. View source mode will allow you to switch to HTML editing mode to insert embedded videos or flash animations. Inline Script is completely disabled for security.
Many permissions combinations available. by default the advance combination feature is turned off – you need to go settings to enable the advance posting options. Additionaly you can setup multiply to cross post your blog to your blogger.com Blog(s).