You can change module weights directly via SQL. Basically you set the weight column in the system table.
Or you can use this module http://drupal.org/project/moduleweight
Although it is for D5, it is a small module and can easily be adapted to D6.
Dipen wrote:I'm looking through the api without much luck. From what I notice, the packages are alphabetical.
By changing weight you mean directly in the table or there is a way to inform drupal that my custom module should be loaded at last. The module listing page at admin/build/modules follow the same weight based order (?) in that case would it mean that it can be controlled by package name?