I ran across this scenario this week and thought you might be interested in an easy way to brand the software portal with your corporate logo.
I renamed the disks.gif file in the %programfiles%\altiris\software delivery subdirectory to disks.gif_bak. I then modified our corporate logo to be the same size as the original gif file making sure the background of the logo was transparent, and named it disks.gif and copied it into the same directory.
The file I replaced provided the CD/Disk logo that was in the upper left pane of the software portal. This was easier than installing the Altiris SDK and becoming a codemaster. Although this is probably now supported, I found it an easy way to brand the software portal that we are about to use for departmental moves and software requests. The end result will look something like the screenshot attached.