Export Google Waves As ZIP Archives Before The Shut-Off

You may or may not continue using Wave as an open-source “box”, but if you want to archive any important conversations you’ve had in it, you can now export a Wave into HTML or ZIP files, attachments included.

To grab your Wave, open it up, then look for the “Export” button on the right side of the top toolbar — it may be tucked under an “…” button. Right now, it’s a Wave-by-Wave basis, but the developers say they’re working on means of exporting bulk Waves, as well as transferring them into Google Docs.

Exporting your waves [Google Wave Blog]