InfoQ explains Google Wave’s architecture, there a link to Waveprotocol and here Operational Transformations (OT) because algorithms are king at Google. Looks like we will all have to learn new termonology.
And for my field of special interest, patents and standards, yet another patent license text:
Subject to the terms and conditions of this License, Google and its affiliates hereby grant to you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this License) patent license for patents necessarily infringed by implementation of this specification. If you institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the implementation of the specification constitutes direct or contributory patent infringement, then any patent licenses for the specification granted to you under this License shall terminate as of the date such litigation is filed.