The latest entry into my Star Wars Expanded Universe Want list would be a new entry in the Essential Guide series of reference books.
In recent years we have gotten a number of much improved entries in the EG line, such as Jedi vs. Sith: The Essential Guide to the Force, The Essential Atlas, and the Essential Guide to Warfare.
One of the key roles these Essential Guides can play is to ret-con conflicting stories and attempt to intigrate bits of continuity that don't seem to fit together.
Perhaps no continuity puzzle is as complicated to unravel then the one surrounding the Mandalorians and the most famous Mandalorian of all time Boba Fett.
After the Clone Wars television series is wrapped up, it would be the perfect time to update and set in order the complete history of the Mandalorian people, as well as a reference source for Mandalorian fans and costumers.
We already have some expanded background on the Mandalorians in the Essential Guide to Warfare by Jason Fry, but think of the possibilities.
Some section/chapter topics could include:
Succession History of the Mandalores
Mandalorian Family and Clan structure
Beskar'gam: History of Mandalorian Armor
Mandalorian involvement in historic conflicts
Mandalorian Cultural Impact on the galaxy at large
Key Mandalorians in Galactic History
As a fan of the Mandalorians, I may be looking at this with a rose colored visor, but given the depth of story telling and amount of conflicting information regarding the Mandalorians it seems like a topic ripe for Essential Guide treatment.