I'll add two to the list...
1- CommissionJunction - Owes me over $140,000 in commissions from 2005-2006 from mortgage lead merchants that claimed "fraud" leads 30 days AFTER they were submitted.
2- PartnerWeekly - Owes me over $45,000 from just last month. Very long story, but in short, they were only willing to pay me a shitty $200 to recoup my costs (which were around $16,000 total), and then tried to recruit me away from the ad network I went through, which is a shady thing to do too. Not to mention they wanted me to promote a different site for them after I was told I wouldn't be getting paid from them. This is only for their Cash Advance/Payday Loan vertical. Their mortgage network is actually very good.
Just goes to show you, that no matter how big or small of an affiliate you are, there is always room to be fucked over. The bigger you are, the harder of a hit you are going to take. Ah well. This is the game we play. This is also why I am creating a service for affiliates to band together so that if and when a network or merchant tries to fuck someone over, they will be boycotted until the affiliate is paid out -- but only if the affiliate is not at fault.
um... how can you lose money if you retired from affiliate marketing?