Ran a search and I didn't find anything like this, but please let me know if this if a repost.
During my guild's Ulduar run tonight, we discovered a neat trick on Deconstructor. If you tank him up against the east wall, when he hits his heart phase, the adds only come from the two junk piles on the west side of the room. None come from the piles closest to him. We haven't done this on 10 man yet, but I'm assuming it works the same way. Made our night a lot easier
Hope this helps people working on him, finally looking to contribute!
Edit: I'll try to get screenshots up at some point, not sure how much they'll prove though.
Edit: Screenshots for the positioning:
http://img514.imageshack.us/img514/8...2709225543.jpg
http://img411.imageshack.us/img411/9...2709225548.jpg
http://img410.imageshack.us/img410/7...2709225555.jpg
Screens are from one of our wipes, first night in there on 25 man. Amount of adds seemed normal for the amount coming from just 2 junk piles.