Ubuntu produces lots of wonderful new innovations with each new release - the Restricted Drivers Manager, the Screens and Graphics application, Add/Remove...
Once these apps are shipped, however, their development stalls, and in subsequent releases of Ubuntu, the same application is included unchanged.
Take, for example, Migration Assistance. This was a wonderful addition to the Ubuntu installer (Ubiquity) with the release of 7.04 that allowed you to migrate many settings and documents from an existing Windows XP installation to the new Ubuntu installation. The specification give some hope:
Support for Windows 2000 and Vista, as well as Mac OS X support will be added.
However, none of that was included in 7.10 which by now has been released. It's Launchpad overview says that implementation is "deferred". Too bad, because in its current state, Migration Assistance can definitely be seen as an unfinished job.
One can only speculate what will happen to applications that came with 7.10, such as DisplayConfig-GTK (the Screens and Graphics application) that only supports two screens, or the Ubufox Firefox plugin, which allows a user to install Firefox extensions and plugins using Add/Remove... but still contains some rough edges.
Of course, we should not forget that there still are some applications that do get developed. For example, 7.10 brought some subtle but useful changes to Add/Remove.... However, considering the many and ambitious plans for 8.04, the Ubuntu developers should take care to make sure applications don't get abandoned. Furthermore, they should keep in mind that 8.04 is a Long Term Support release and should therefor be careful with adding lots of new innovative features without thoroughly testing them. If there's one release that needs to be reliable, then it's this one.
PS. Yes, it's not that big a problem - this just made for a catchy headline ;)
Update: A perfect example: since Dapper (when the Ubuntu installer Ubiquity was released, I believe) Ubiquity isn't fully visible on resolutions of 800x600 or lower. Still not fixed.