If you're interested I suggest you all obtain (and watch) the ITVV Virgin 747 LHR-SFO Video/DVD.
A visual into RWY28L is flown with a united 757 parrallel on 28R.
ATC clearly state to 'maintain visual seperation from that A/C, and DO NOT OVERTAKE'. They fly it with TCAS set at TA only to avoid any resolutions.
The a/c touch down simutaneously, and it is a very good insite into parrallel operations - although it is obviously no big deal to the crew.
Cheers all..
