I have switched the life stream over from Tumblr, which worked phenomenally for me when I blogged live from the California marketing convention, to the new Soup, which copies the themes of Tumblr for tumble blogging, but offers a different customization and automation feature set. I can't speak to posting, because I haven't made any (it was extremely easy on Tumblr), but importing my postings and feeds from flickr, del.icio.us, youtube, digg, twitter, and blogger is dead simple in Soup. All you do is give your usernames for each product, and the feeds are automatically pulled in. Additionally, as the posts are made into your new tumble blog, they are tagged on the right with little icons of the imported service, so it's clear to the reader where everything came from. For my purposes now this seems like a better way to handle my life stream feeds.
Old life stream on Tumblr
New life stream on Soup