Germany

[edit]Default data rate
€0.24 / MB. See link for more information.

[edit]Data feature packs

 * 100 MB: €3.90 - lasts 30 days.
 * 1 GB: €9.90 - lasts 30 days.
 * 30 days unlimited data use: €19.80

See link for more information.
 * 24 hours unlimited data use: €2.40.

[edit]Availability
blau.de is an online only operator. They post the SIM card to German addresses only, though you can request billing to a credit card, which can be any address (ie, does not have to be German).

[edit]SIM sizes
Standard SIM is sent out; micro SIM available for €12.90 (see link ).

[edit]Tethering
Unknown.

More details

blau.de offer €10 to both you and a friend if you recommend a friend. Google Chrome does a good job of translating the website, which is entirely in German, automatically, if you are unable to understand it.