Per the suggestion of grudnik here, I have decided to create a list of transfers that have occurred already, as well as a spot for people to discuss rumors and other deals. Here is a current list of what has occurred officially during the spring/summer (links where possible).
Kirchoff and Götze to Bayern, Peterson from Bayern to Werder Bremen (obviously).
Andy Carroll from Liverpool to West Ham on an undiclosed fee.
Hueng-Min Son from Hamburg to Bayer Leverkusen for €10m.
Sokratis from Werder Bremen to Borussia Dortmund.
Leonardo Bittencourt from Borussia Dortmund to Hannover 96.
Santana from Borussia Dortmund to Schalke 04 for €1m.
The above are just some of the most notable deals that have occurred so far. For a list of every official transfer, click here.