Drupal extension?

Hello Emir,

At the moment I'm using Joomla because I love this CMS. However I'm thinking to start to use for some projects the Drupal CMS. Some BIG sites like NASA, YAHOO and many others "strong" websites use Drupal for stability, security and flexibility reasons.
What do you think to diversify your business and code some modules for Drupal? Well, I'd be an happy customer 

Which ones would be most required?
Since I have been in core team of Mambo and Joomla I avoided using other CMS's so I'm not very much into them but why not.

Hello Emir,

At this time I have not a good idea about drupal because I need to finish first a big site with joomla. But I will be happy to give you some ideas when I'll start a site with this CMS! Frankly, I'm waiting the new Drupal theme club at Rockettheme because the actual themes for Drupal are very very bad. Andy Miller is planning to open a theme club.
For sure, Drupal is a niche for theme and good modules.
Drupal have a default url rewriting very good. So, SEF Advance for Drupal is not a good idea. Also, the users management is very powerful. But I will have some ideas very soon

If you want to have a look at the actual modules for Drupal just go here:
drupal.org/project/Modules

Hello,

I think it will be a good start if you can offer ajaxlisting and ajaxrecommend modules for Drupal. Another request is a Geo Location of the users and visitors in a Google Map; moreover, I have this request for joomla too (to show visitors and CB users). Like Geo Community component try to do but without success since there is some serious bugs!
Since those CMS are use for big communities a Geo Location addon showing avatars and some users info will be great!