Phill Ryu, a man who must have some sort of direct neural interface with the Mac shareware community, has posted a list of applications which could very likely be killed off by features of Mac OS X 10.5 Leopard which were announced yesterday. Seasoned OS X users will have immediately seen parallels between many of the new Leopard features and software that has been available for some time.
Most obviously, Spaces are just fancy names for virtual desktops; something that can be easily achieved by VirtueDesktops, DesktopManager, and VirtualDesktop Pro. The new application launching features of Spotlight take aim at popular applications such as LaunchBar, Butler, and my personal favorite of OS X applications, Quicksilver. With iChat, tabs kill off Chax, live presentations kill off ShowMacster, and backgrounds kill of ChatFX.
Be sure to click through to the original post for all the other apps now lining up at the unemployment window, and to see what the shareware developers themselves have to say about the announcements.
Update: Buddy'o'mine and BarCamp mastermind Chris Messina has a similar post.