We created a new (and free) domain portfolio script one month ago.
You can download the script by following my signature link and you can see the script in action
HERE.
Some of the script's features:
Easy installation/setup.
Unlimited domain and category listing.
Easy-to use backend.
Add domains to multiple categories.
Bulk upload functionality.
WYSIWYG for easy content management.
Fully-automated offer system.
Fully-automated mailing system.
Integrated RSS feed.
Meta tags integration for SEO.
Upload logo for brandability.
Professional search function.
Customizable Thank You pages.
Sales management with Paypal integration.
Tell a friend functionality.
Integrated Backup Solution.
Unlimited updates and support.
Sponsor management for added revenue.
Website skins to change color of site with just one click
We actually just upgraded to V1.2 which comes with an integrated backup functionality. Once you have all your domains uploaded to the script (by bulk upload) you can simply export this as a backupfile with one single click.