Just wanted to mention that I did finally get the $50 credit from Sony Rewards for my PRS-505 reader, nearly two months after purchasing it online. I never called Sony to ask why there was a delay because the offer did mention 8-12 weeks to receive the credit.
It was actually a $52 credit listed as "CouponID(Other)" on my account, credited Aug 4 2009. As I mentioned in earlier posts, my initial purchase was for $298.50 (NOT $299 or more) on June 8 2009.
I have already burned through the $3000 charges necessary to get the three $100 credits from Chase (in less than two months), so now it's time to cut up the Sony VISA and return to my normal credit card. btw my experiment shows that despite Sony's somewhat-unclear wording, you get $100 immediately, $100 if you charge $1500 in the first 3 months, and another $100 if you charge an additional $1500 anytime in the first 6 months. You don't have to wait until the 4th, 5th, and 6th months to do the additional spending of $1500 to get that last $100 credit.
Sure wish every credit card I had paid me 10% cash back, but alas this golden goose is now dead