We will be performing scheduled game maintenance for Diablo 3 on Tuesday, December 4th. Maintenance will begin at 5:00 AM PST and is expected to last for 2 hours. During this time Diablo 3 will not be available for play. In addition, many web services will be unavailable.
I posted in a similar thread recently, and I’d highly suggest you check it out, because it goes into the nature of probabilities and how Magic Find works in Diablo III.
In brief: drops are in no-way controlled on a per-player or account basis. What you are experiencing, be it a Legendary hot streak or dry spell, is simply a result of RNG. (Blue Tracker / Official Forums)
Drop Rate Decreased?
Since patch 1.0.6 did not change any of the drop rates I would say what you are experiencing is, unfortunately, simply a bad luck streak. I know it can be hard to believe after a very long run of previously great luck, but we truly didn’t lower the drop rates of Legendary items.
Biggest Avenger Mob
I think the largest Avenger monster I have ever seen was a Blood Clan Occultist. When I saw it I wanted to treat it like a punch balloon but I didn't have a Butchers Sickle or Ancient Spear. (Blue Tracker / Official Forums)
Curse 2012 Holiday Wishlist
Curse is holding a grand Holiday Wishlist competition where fans can win awesome prizes, including some Alienware machines, just by voting in a poll! To enter you must visit the Alienware Holiday Wishlist 2012 site, press the "Enter Sweepstakes Now" button and vote for one of the wishlists created by Lindsay, Evan, Weatherman Rob and FPS James.
Need something more personal? You can create your own wishlist that can be shared in Facebook and Twitter, to let your friends know what must be bought in order to satiate your needs this year. To do that visit the contest site and just click "Add to Wishlist" next to the items you'd like added. Then share your list by clicking on "Your Wishlist" at the end of the row.
You can also read some more information about the contest on this page.