Module development and code questions

I suppose this is a stupid question but here I go: am I supposed to set up a cron job using my web control panel to run cron.php daily? I don't suppose it magically runs itself. I've just never read any docs that tell me to do that.

Jay

This is mostly a request to change (or maybe extend) the current model.

Please, compare with the phpBB or WordPress models.

phpBB has its own official database for MODs and Themes. Developers may host their contribs at other places (there are lots) or even at their own sites. People in certain phpBB Teams validate what authors submit to be published at the official repository, but development and or support may take place wherever. phpBB offers some forums for authors and contrib support, but that is not required.

I want to add paypal functionality to my website. But I couldnt be able to fine paypal_framework.module (as paypal_subscription.module is dependent on that.) . Can anybody tell me where is this module.
Thanks in advance.

hi, I use upload.module to upload files but I can filter type of file. How can I do that?

How can i create a directory list like the one at http://www.ent.iastate.edu/list/, I can't understand how people make the directories like yellow pages or the one listed on the http://www.ent.iastate.edu/list/ website. Are there any modules available to do it? Are there tutorials on how extra tables can be created in the DB and accessed through custom build modules?

Whenever I try to look for a single page turorial or guide on how to create Drupal Modules, I have to go through piles and piles of information. Is there any most simplest one page guide on How to create Drupal Modules?