The night before I was scheduled to take SCEA Part I (Tuesday) I stumbled across this forum. It turns out I missed my time and wasn't able to take it till this morning.
In the intervening day, I looked through most of posts here and followed many of the suggested links in the FAQ. I learned about Whizlabs and ePractize and took their free sample tests, as well as the other free tests in the FAQ.
My previous study aids were solely the Cade book and Head First Design Patterns.
I really think that this forum is the reason I passed this exam! Just going on Cade's book I was totally unprepared for Messaging and Legacy Connectivity!