I run pegged to the main tank and use macros for all my stuff...such as:
/macroicon "Bio II"
/ac "Bio II" <tt>
/ac "Bio II" <t>
I put both in because if I am solo, it'll hit the first and not have a target of target and skip off to the following macro to only target (and this way I don't have to use another macro or the default on my bar, obviously). I thought about doing this for the mob and <tt> my heals so they get bounced to the tank, but when boss mobs shift off to other targets and I catch the opportunity to top off the tank, the heal goes to the new member instead of where I want it. Pain in the *** if you are trying to spy the cast bar for the boss, but meh... I deal.
"We're getting close, real close. And now for some more bad news... Ready?"
-- Egg Shen