Posting this here, had no idea I had to pick a talent in the talent tree, thought I got everyone I opened up (heh). So this was helpful in clueing me...
Some of you might know Seatin from...
Check out ChaChing! as well, that addon lets you know what the Broker will buy for more than just selling the stuff at the AH.
Some good info here...
Here is also a picture of an AH item list for DPS engineers...
post 648 in this thread by Zandare. Its on page 33 if the link doesn't work well....
I've been using this one as well
This is a nice thread, lots of good info...
Here is a mailbox addon that I haven't tried yet, just found it, but it looks like it does everything I want....