Not all Youtube vids have HD. But i'm guessing your trying to watch one where you know for a fact that it does have HD.
And yeah, the memory errors i get when browsing ***** the S*** out of me I mean come-on, it's a ps3 for heavens sake! it should be able to make you coffee aswell and it's telling me i have low memory!
Check out: "ps3youtube.com" in your PS3's Internet Browser.
Remember: This website is made especially for the ps3 so it only works as intended on the ps3...on the pc links will be redirected to YouTube
its crap how bad youtubes videos look on this browser its 2012 for crying out loud. how bout an update? where's the HD???
Give it a couple of days and they'll nobble the website (again!) to cripple it on the PS3 browser (again!).