Sony's PSN is down - and I think Steam is to blame

For those that don't have a PS3, you probably do not care about this...  But for those of us that use our PS3 for gaming and more, this is really important you guys!

Here's my hypothesis - Sony's Playstation Network (PSN) was not brought down by "hackers", rather it has crashed one day after launch day for Portal 2.  Portal 2 is the first game that has brought Steam to the PS3, even though Valve had previously released games for the PS3.

Here's what had lead me to this hypothesis - Portal 2 was officially released on April 19th (potato searching notwithstanding).  Sony's network outage started on April 20th.  Something tells me that, like the last time there was a major PSN outage, it was the result of an untested Change.

I'm sure that the admins at Sony haven't really given much thought to what the integration with Steam Cloud has done to their Availability or Capacity plans either.  But hey, we've already paid for the hardware - why bother supporting the software?