Ladies (?) and gentlemen, the first preview of ZFS on FUSE/Linux with full write support is finally here!
You can consider it my (late) Christmas gift for the Linux community ;)
Don't forget this is an alpha-quality release. Testing has been very limited.
Performance sucks right now, but should improve before 0.4.0 final, when a multi-threaded event loop and kernel caching support are working (both of these should be easy to implement, FUSE provides the kernel caching).
For more information, see the README and the STATUS file for working/not working features. Download here.
Let me know how it works, and don't forget to report bugs!