Broken BTC withdrawals from Gox are piling up bigtime as we speak. There are nearly 200 broken transactions -- totaling almost 4000 BTC -- and some have been waiting more than four days!! Most are stuck due to outpoints already spent. Data is here: http://skanner.net/MtGox/mtgox_tx.php
And yes, 25% of my own BTC are currently stuck (26 hours and counting).
There has been zero official acknowledgment of the issue, and they're not even responding to support tickets related to this situation. The only contact anyone has made with them is with their IRC consultants who don't know a damn thing. The IRC support stated that they think "it is being caused by a bug or attack of some sort," but they haven't provided any additional information at all.
This is getting serious... VERY serious.
UPDATE 1: (1400 EST, 26 JAN 2014) This situation is reaching EPIC proportions. Current broken TX status: More than 400 broken TX totalling nearly 10,000 BTC!! With skanner.net being broken, as well, you can track the current broken TX situation here: http://thegoxreport.com/
UPDATE 2: (2230 EST, 28 JAN 2014) Current broken TX status: 1654 broken TX!!!