I appreciate that people are a bit frustrated at the waiting times for Gran Turismo 5, but one must put things in context before taking action;
1. All the hype about release dates and time frames have almost nothing to do with either SONY or PD. Alot of the hype instead stems from websites taking pre-orders and framing dates with little or no basis and, let's be fair, unannounced and unreleased information appearing on excited fan sites. Sure, a few SONY media publications had Q4 2009, and KY has broadly mentioned a vague time frame in a few interviews over the years. But nothing was officially announced (except, of course, that March 2010 Japan date). Alot of the problem really has nothing to do with SONY. They probably won't know why you're all so upset, and I can sympathise.
2. The release date, although delayed (from March 2010), may not be delayed by much and has nothing to do with 95% of GTPlanet users since none of us live in Japan. Even if it is delayed by a time, it's not like they don't have a good reason (other AAA titles in the same month, though I am somewhat skeptical about the various other reasons given). It's also the ONLY 'official delay' so far, and again, it doesn't affect most of us anyway (SONY has stated on several occasions now that this delay hasn't affected the US/EU timetable). So really, one official delay of possibly only a few months (or even less) isn't exactly scandalous.
3. In relation to GT5, we've already had both an extensive 'demo' (in the guise of Prologue, which is pretty generous) and the time-trial, out last month. As gamers in general go, we've done alright...
If you have to spend your time on the PlayStation, there are plenty of great titles to keep you busy (even Gran Turismo titles)... So please, everybody chill out.