First of all, here I mean only the user apps, like browsers, mp3players, etc. Not system components like kernel or alsa.
I understand Ubuntu's community concern about stability. That's an important point why Ubuntu doesn't get major updates to software included in current Ubuntu release. But I guess, I can suggest a way out.
As you might know, Ubuntu repos are divided the following way:
-main: the apps that are thoroughly tested since they are included by default and are percepted as important components of Ubuntu distro
-restricted: components that simply can't be supported by Ubuntu community, since they are proprietary software
-universe: packages that are being maintained by 3rd party, not officially supported by Ubuntu community itself.
-multiverse: non-free pieces of software
As you can see, only the components included in "main" are officially supported and thoroughly tested. My point is, why not offer more frequent updates to components in other repos? Say, Banshee, an interesting and relatively popular mp3 player got a final 1.0 release recently, featuring many improvements over 0.13 version which is in Hardy repos. And, this package is in Universe, so users don't get any guarantees from Ubuntu project anyways. Then why not update it? Just to the version that the original package devs consider to be stable. Or wine, which got a long-awaited 1.0 release. Why users should wait for months to get an update to a package that isn't supported anyways?
Another point, is that there are some packages in main repo, that need updates, but can't get them again due to policy. But there is backports repo! Following Debian tradition, backports include fresher versions of apps without updating system-critical ones. For example, transmission in main has version 1.06. Actually the latest version is 1.22. And it also has vital changes: better multi-tracker support, etc. And they are actually really important. So why not include it to backports?
So, to sum up, my suggestion is to update apps in backports and all repos (besides main) more frequently to keep up with other distros (Mandriva, OpenSuSE).
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