Alpha 3 is the third in a series of milestone CD images that will be
released throughout the Hardy development cycle. The Alpha images are known to be reasonably free of showstopper CD build or installer bugs, while representing a very recent snapshot of Hardy.
Read the release announcement
Pre-releases of Hardy are *not* encouraged for anyone needing a stable
system or anyone who is not comfortable running into occasional, even
frequent breakage. They are, however, recommended for Ubuntu developers
and those who want to help in testing, reporting, and fixing bugs.