Adobe AIR 1.5 for Linux
One of the engineers on my team prefers to use Linux for development (specifically writing Java code in Eclipse), but has been a bit dissatisfied with Adobe’s release lag in pushing out Flash run-times like AIR for Linux (Ubuntu in his case).
A month after the Adobe AIR 1.5 release on the major platforms (Windows and OS X), Adobe has released AIR 1.5 for Linux, which covers the Ubuntu, Fedora, and openSUSE brews. Even 64-bit Linux users can join in on the fun (http://kb.adobe.com/selfservice/viewContent.do?externalId=kb408084&sliceId=1).
More detail is available on the Adobe AIR blog: http://blogs.adobe.com/air/2008/12/adobe_air_15_now_available_for.html