Google wants to differentiate from Facebook by offering a lot of ways to export your data. Google Takeout is a feature that's included in Google+, but it's also available as a standalone service. You can use it to export your contacts, Google Buzz messages, Picasa Web photos and Profile data with one click.
"Google Takeout lets you take your data out of multiple Google products in one fell swoop. Moreover, you’ll find that all your data is in portable and open formats‚ so it's easy to import to other services quickly," mentions the Data Liberation blog.
I've downloaded my data in a huge ZIP archive that included all my Buzz posts saved as HTML files, VCF files for my Gmail groups and the first 100 photos from each of my Picasa Web album. What's the point of downloading the first 100 photos?