Okay, time to sum all the major things I like about the EU in one post. So, in alphabetical order:

The Alan Moore comics

Beldorion the Hutt

The Corellian Trilogy

Dark Empire I

The drawings in the Jedi Prince series

Exar Kun

Exar Kun's double-bladed blue lightsaber

Force organizations beyond the Jedi & Sith

Freedon Nadd

The Galaxy of Fear series

King Ommin

Kir Kanos

Leia's red lightsaber

The Marvel comic books

Multiple lightsaber colours

Naga Sadow

The newspaper strips (Archie Goodwin's more than Russ Manning's, though)

Pre-PT Boba Fett

The pre-PT Clone Wars

Pre-PT Darth Vader

The pre-PT Jedi

Pre-PT Palpatine

The pre-PT Sith

The Star Wars Tales comics

The Tales of the Jedi comics

The Thrawn Trilogy

Warb Null (yes, this is the name of an actual character in the EU; Google him up if you don't believe me)

Waru

Waru's universe