Adobe has a Creative Suite with a unified look and feel that is very easy to work with for people who daily work with the Adobe Creative Suite programs.

Information about Adobe Creative Suite:
http://www.adobe.com/products/creativesuite/

Information about Gimp, Inkscape and Scribus:
http://www.gimp.org
http://www.inkscape.org
http://www.scribus.net

In the Dutch C'T magazine from January they test a couple of applications including Gimp.
In the test Gimp is slow and not the right program for fast Photo editing.

the problem is that we are not able to impose the images of diffrent formats on the desktop

My aim is that image of any format can be placed on desktop.

Whilst many Layer effects can be acheived in GIMP using GEGL this technique is rather un-userfriendly and makes effects such as self shadowing unnecessarily convoluted.

well so many of people suggested about gimp not use 3 windows.actually i and many i suppose(noobs) get scared when they see 3 windows all around desktop when they open Gimp(although there is a non official port called gimpshop but its outdated and not as good as gimp).
PS(photoshop) is setting web standards great piece of work but gimp too can compete with it.some needed changes:
*****single window.
****compatibility with photoshop filters .8bf filters,more support
****better documentation
**better icons and UI redesign(although i just saw feature planned for gimp next version 2.6) still deserves attention of developers.
**better support for pre defined key in photoshop also can be used in gimp
key combinations(keyboard shortcuts like ctrl+alt etc)
i am huge fan of photo editing software and web design somehow...usability in some software breaks barriers of commercial and free software.

I think it would be useful if nautilus could show preview of gimp's xcf files in thumbnails like it does with jpeg and png files

Tabs allows us to quick navigation to files,features,docks,pallete,brushes etc,adding tabs to make it look better than Photoshop,here is a mockup
http://www.gnome-look.org/content/show.php/GIMP+3?content=49951
Hope developers listen.If there are plenty of Windows docking
inside single window and treating all windows inside on big window is solution.also there should be a property in "Windows" menu like
windows>>reset docks to original location,reset pallete,reset
presets for brushes etc.

GIMP is really a wonderful image manipulation program. But many of its features are, in fact, unnecessarily complicated. For example,one has to create a new layer before pasting a copied image. GIMP should be able to create a layer automatically for the image pasted and there is no need of letting it remain as a floating selection. And the anchor button, then, should be used as a tool for merging down the layers.
Logo and Text Layer in GIMP should be preserved as vector.And the installed plug-ins should be accessible from a single menu itself.Previews should be available to all the filters. Finally, GIMP should have a workspace of its own.

We are constantly discussing the relative benefits of open source software when compared to its commercial counterparts, and GIMP has somewhat become the posterboy for this ideology as it compares very favorably to Photoshop the industry standard software for image processing.
However, GIMP suffers from several omissions which mean that many professionals cannot see it as a viable alternative and as such cannot make the switch to linux.
The most obvious of these is the inability to edit in CMYK as opposed to RGB making GIMP impractical for individuals making images for print as opposed to digital distribution.

Gimp should be attractive to lay users. With easy tools and dynamics. The Gimp will be a step in usability. This is easy to implement.