Module development and code questions

Is there any way to have all node teasers be displayed on the site (e.g. the main page) but give the "no access" message when the node is visited? I ask this because I am working on a paid-content site and would like users to see what content is available but not see the whole story unless they have the required privileges.

How would I go about writing a module for this? Or does one already exist?

Hi-

I am a beginner php programmer (though very good at learning through example) and I am attempting to modify the Image module to output the gallery in a different format along the lines of
_______________________________________________________
|[thumb1]*| [Description]
|********| [link to full sized image1] [link to attached pdf file1]
|_________|_____________________________________________
|[thumb2]* | [Description]
|********| [link to full sized image2] [link to attached pdf file2]
|_________|_____________________________________________
|[thumb3]* | [Description]
|********| [link to full sized image3] [link to attached pdf file3]
|_________|_____________________________________________

*=blank space

Several questions:

1. How do I use the modified image.module (to be renamed pdfimage.module) while continuing to run the original image.module- where are all of the instances where i must modify the code or file/directory names or global variables, etc? This is my most important question, how to run multiple instances of image.module...

2. How do i call the attached file location using my node? I am using the attachement module to upload an attached PDF files...

3. Is there a way to automatically generate thumbnails of (page 1 of) PDFs? How do I incorporate this into image module?

4. Is there anyone who has coded something very similar and would be willing to share the code? Is there anyone who would like to code this for me (for no cost :)

I'm trying to port the functionality of an image gallery I had made previously (based largley on phpMyPhotos), into a drupal module.

I'd be generating nodes on-the-fly (is this a good idea?) during browsing image files/dirs on the filesystem abolishing a need to upload.

Is there any Quiz module which offers some basic featuers of online quizzes available now? For "basic features" , I mean that the administrator can create some multiple choice questions and when visitors complete those questions, they may either get a numerical score (just like a regular quiz) or some comments on their choice (like a kind of personality test, or fortune telling). Thanks a ton!

I want to enable Craigslist style postings.

That is, I want anonymous users to be able to create nodes; they will receive an email with a link to confirm the post. The user can also edit or delete the post from links in the email. (other anonymous users will not be able to edit or delete the post).

It's almost like giving users a temporary account for each post; they are automatically authenticated when clicking on the link (which will embed the node id and a random passcode).

What is the best way to build this?

I think I am ready to submit blogroll as a project. Since this is my first module I wanted to get some initial feedback to make sure this is the right course of action and to check that I'm not duplicating anyone's work that I may have missed. I will checkin the following files to the contributors-cvs/modules/blogroll/ directory.