While I think a trade of Iggy will be tough to do and get value, here is how the Sixers should approach such talks - focusing on providing the extra value to help solve other teams' problems. Here is a potential trade:
Orlando Magic get:
Andrew Bynum Andre Iguodala Lou Williams
Magic replace a superstar they are losing, but gain 2 stars and depth that they sorely lack. They can then dump Arenas' salary via amnesty to free up some cap room.
L.A. Lakers get: Dwight Howard Jameer Nelson Andres Nocioni
Lakers get the best player in the league and another generation of stars to carry on their tradition, since they've already committed to a coaching change and to move away from the triangle offense.
Sixers get: Kobe Bryant Matt Barnes Daniel Orton
Finally the Sixers get a superstar, albeit an aging one. They sellout games almost immediately and have a tremendous veteran talent to combine with their young nucleus. Minutes free up for both Thad Young and Evan Turner.
I actually believe this trade provides value to all 3 teams in their current situations. Would provide some Christmas excitement in Philly, ya think?