Node Field module allows you to add custom extra fields to single drupal nodes.
It's not connected to fields module, so different nodes of one content type can have absolutely different sets of custom fields.
The Term Sibling Reorder module allows taxonomy term administrators to reorder a term and it's siblings from the add or edit page for a term.
This is especially helpful if you're using taxonomy for something more than backend categorization. If you have a list of all terms in a block for navigation with Views, or if you're using Taxonomy Menu with the sync option (currently only in the 7.x-1.x-dev release), this module can let you add a term without temporarily affecting your site's output.
Features
Place a term within a hierarchy from the add/edit form.
Reorder siblings to a term from that term's add/edit form.
Integrates with Taxonomy Menu if you have it configured for the vocabulary (see below).
Works well with with Taxonomy term Views (if you use the "Taxonomy term: Weight" sort).
To integrate with Taxonomy Menu:
As of May 12th, 2012: you must install the 7.x-1.x-dev release (I expect it will make it into a 7.x-1.3 release when there is one).
Configure Taxonomy Menu for the vocabulary as you need to.