I've been reading through this whole thread to see if it finally led anywhere, it didn't. As most have said the 50th anniversary celebration was pitiful and Jimmy just keeps on being Jimmy - manjana, manjana! Some people made reference to 50th anniversary celebrations of other bands and of how much more impressive they were. Well to be fair The Beatles 50th anniversary celebration was even less impressive than Zeppelin's - nada. I mark the Beatles beginning as the day they went into the recording studio with George Martin, June 6th 1962. Their first album, Please, Please Me (UK of course), was released on March 22nd 1963. Celebrations? Zip.
They have released Sgt Pepper, The White Album and Abbey Road as 50th Anniversary releases which is great but I don't get that ignoring their 50th anniversary (i.e. 62 or 63) was nothing but a real letdown to their fans - we didn't even get a fecking book! Perhaps it was thought that the massive disparity between early UK and USA releases made things too complicated. I understand that, especially if they had at least given people a heads-up so that we wouldn't expect to have the Beatles, as a band, get a 50th anniversary celebration.
Like I say, Zeppelin's 50th sucked but the Beatles didn't even have a 50th!!