sid)
Alpha port is continued to be developed. The automatic package build daemons for Alpha are operational.
lenny)
This will be the next Debian release. The port is currently requalifying for inclusion. Please note that inclusion is not guaranteed!
etch
This is the latest Debian release which includes the Alpha port but only those machines which can use SRM/aboot to boot can be installed with the new installer.
sarge
This release had full support for Alpha.
woody
This release had solid support for Alpha and is the last one to support machines soly using milo (i.e. not SRM).
potato
Potato has much more software available and supports more types of Alphas than slink did.
slink
The Alpha port was initially released with this release.
Quite a lot of hardware is now supported on Linux/Alpha. Unfortunately, the exact combination of machine, hardware and kernel version is non-trivial, so if you don't find your combo in this list on alphalinux.org, and researching the list archives for Debian and Red Hat-AXP-Lists neither yields a result, then subscribe to the Debian-Alpha list and ask. Usually someone has tried already and can provide useful information.