Moving from joomla

Prepare for long exhausting night browsing forum for answer.. or reach deep into your pockets to hire professional helps :)

http://drupal.org/node/80195

If you will use Drupal 6, this module can help you import the content, categories and users: http://drupal.org/project/joomla

In general, http://drupal.org/project/migrate is helpful to import content from other CMS.

Suggest to go through the data model of both system, then you will see it's not that hard, and just some MySQL effort.

Currently, no tool could help you unless you only use very basic function in Joomla, like create article, etc.

I have been there and suffered! The Drupal way is just different from Joomla.

I tried all sorts and eventually ended up rebuilding from scratch (not a little site either).

I am however glad I persevered, Drupal has worked sooooo much better for us!

(CSV importing can help as long as you create your content types correctly in Drupal and clear out invalid fields in CSV files.)

My method would look something like this:

Temporarily continue Joomla use (but try to pull back on new content creation) -> Create Drupal site functionality from scratch -> Set up content types in Drupal -> -> CSV export from Joomla all possible content -> CSV import content into Drupal -> Theme Drupal site ->Last minute back up of Joomla site and update of any new content to Drupal site ->Upload Drupal to temporary url (e.g. migration.yoursite.com) -> test throughly in offline mode -> switch domain to Drupal site ->allow a week or two before deleting the Joomla files from server (in case of need to revert)

if you have lots of regular users warn them repeatedly of the upcoming change and then keep them updated throughout the process. Tell them how much hard work you are doing to make it better for them to use your site and the reasonable customers will appreciate it.