Module development and code questions

Hi! I installed i18n and all parts of it and it works nice but there are some strings I cannot translate because it doesn't find the original english term from drupal. E.g. the main menu items "Forums" can't be changed and some other, e.g. "feedback" and "administer". There are other occurences of these that are translated fine, but with these the non-english page looks like a mess.

Anyone pursuing a traffic module? I'm thinking something could be cooked up to use this service (seems possible):

http://www.bindingpoint.com/service.aspx?skey=4672

Is there a Hook for when a module is unloaded.

Example:
I create a node module.. when I unload the module.. the nodes stay active but not all the data displays as the code is not there to load it up..

I would like to when someone unloads the module to insure all the nodes are set inactive, and once the module loads again I can re-active them..

I don't see those options, to either do something once it is activated or de-actived..

ideas?

When I enable the category module I get a bunch of errors on the modules page. I have a table prefix for drupal, which is "drupal_" could that have anything to do with it? Or is it something else?

The error I get is:

I'm writing a new module, 'Image Set.' It works along with the image module and provides image sets similar to Flickr's. The advantage of this module over the image galleries that are provided by image is that you can alter the order of the images for display any way you like. According to what I've been reading here in the forums, people were searching for alternatives to image exactly because the display order couldn't be changed, so I'm writing a new module that allows just that.

I set it checked in the content type configuration. But it does not work.

Any workaround?

Thanks