Can jQuery help me?

I am currently checking out jQuery to see what the hype is all about and if I can use it to make the client work better.

Features I could use:

• Selectors - I already thought about an own alias function for the annoyingly verbose document.getElementById.
• Position for centering divs properly. Also maybe for some other things.
• Tabs - I already have an implementation of a tabbed container for the chat, but maybe I could make it better with JQuery.
• Drag & Drop - For inventory handling and putting spells into the quick bar
• Sortable for inventory handling (maybe)
• Resizable GUI windows