Gimp 2.8 is released, but on Ubuntu repository you just can get GIMP 2.8, i don't know why the Ubuntu repository not update the GIMP version. If you want to get GIMP 2.8 in your ubuntu machine, just using ppa repository. I am using otto-kesselgulasch ppa to update GIMP to 2.8. There is step by step how to install gimp 2.8 through the ppa.
I've write about how to install svn Blender update on Ubuntu. Iam using cheleb blender ppa to update it. But, cheleb ppa now is offline, we can't update news svn build from this ppa. But new blender ppa with name irie now available for replace the cheleb ppa.
You can install Blender from Ubuntu 12.04 repository, but you just get Blender 2.62. In main site you can download Blender 2.63a stable release. And you just can download portable Blender for Linux on the main site. But with the ppa we can download and install Blender on the system. You can open Blender file with clicking the blend file. Its different when you are using portable blender apps. You must open blender first and then open the blend file from the blender.
You can install Blender from Ubuntu 12.04 repository, but you just get Blender 2.62. In main site you can download Blender 2.63a stable release. And you just can download portable Blender for Linux on the main site. But with the ppa we can download and install Blender on the system. You can open Blender file with clicking the blend file. Its different when you are using portable blender apps. You must open blender first and then open the blend file from the blender.