I don't see why people are so mad about this anyway, unless you had playstation plus, people should be happy psn is free. I hate when think they deserve something that they don't, it's even more stupid that some people traded their ps3's. Oh noes! We can't pwn nEWbs in call of duty no mo! It was one month. Not a year.
It's mostly not about the service being down. It's about people's personal and credit card details being stolen. You wouldn't want people to just walk in and take money from your bank would you? Well, people trusted Sony and they screwed it up. Big time(s).
Also, the PSN was supposed to come with the price of the PS3, if I paid the extra money with expectations for a free online service that was actually online, I'd be angry too..
And for developers on PSN, the number of sales lost each minute, let alone in a month, were probably staggering. Companies can die when their games get held back like that