In order for people to get the latest beta images, they need to become a member of the forums. I rely on your feedback to make changes public.
Head on over to the forums and sign up. There is a specific section for beta images:The Flirc Forums
As the beta releases progress and get improved old ones will be unavailable. As beta's are approaching being released to everyone they change into a release candidate (or "RC").
e.g. Beta 2 is newer than Beta 1 but RC 1 is newer than both Beta 2 and Beta 1
All the latest beta images have been pulled. The release candidate is now 1.0.5 stable, and the beta firmware is now labeled 2.0 (included in the 1.0.5 GUI)
See this article for installation instructions.