ok richard i've redone the layout, and published 3 images here: http://rhombus-tech.net/allwinner_a10/news/
the 3rd one - showing the full extent of the 4 diff pairs - is enormous (right-mouse-button, view image) as it's a screenshot from this laptop's 3000x1800 LCD. so you should be able to zoom in without losing resolution.
unfortunately since taking the screenshot i noticed that the GND runners between the diff-pairs have been removed: i will restore these. PADS has a bug where when you switch off "locking" of tracks / nets it can suddenly decide "ohhh i'll just re-analyse this lot and remove anything i don't like the look of" which in this case involved removing several shielding GND vias and some of the manual GND tracks that help with shielding, in places where flood-fill could not reach due to the small size.
anyway i'll add back in the 5mil tracks between the diff-pairs, if you're wondering why they're missing (they're not).
to make it easier to view i switched off layers 2-4, leaving top and bottom only. the HDMI tracks are only *on* top and bottom, anyway. they're all length-matched diff-pairs to within 0.1mm, the clock lines are something like 52.8 mm and i think the shortest one, Tx2, is 48.5mm something like that.
l.