I am really confused on one thing - how do i make taxonomies Hierarchical? I know WordPress 3 lets you. For example, using Ultimate Taxonomy Manager, how could I make:
PC -> (Dell -> (Model A -> (A.A | A.B | A.C), Model B, Model C) | Toshiba | HP)
MAC -> (MBP | Mac Book | iMac -> (2008 | 2009 | 2010))
Clearly, the last level can be done as a custom field. But how would have have Hierarchical levels?