I have mixed feelings on the EU; I like a fair sized portion of the EU written prior to TPM's release - though a lot of the novels released during the 90's are pretty poor stuff - but I haven't much love for the modern EU due to all the prequelisms and comics-styled "event" storylines that have infected it.

As for what I consider canon, here is my more-or-less comphrensive guide to it

http://originaltrilogy.com/forum/topic.cfm/What-do-think-of-the-EU-and-what-do-you-accept-as-Star-Wars-canon/topic/16048/

If you just want a brief overview, though, then it goes something like this:

CANON

A fanedit of the OT that exists only inside my head.

My own alternate version of the PT that exists only inside my head.

Raiders of the Lost Ark.

Indiana Jones and the Last Crusade.

Willow.

DEUTEROCANON aka SECONDARY CANON

A large portion of the pre-May 19, 1999 EU.

A small portion of the post-May 19, 1999 EU.

Indiana Jones and the Temple of Doom.

Most of the Indiana Jones comic books.

THX 1138.