One thing that doesn't seem to be common knowledge are some of the targetting references.
<t> - current target
<bt> - targets an enemy being attacked by you/your group (I think)
<st> - allows player to select target (any) for an action
<stpc> - allows player to select any PC target for an action
<stnpc> - allows player to select any NPC target for an action
<lastst> - recalls the last selected target
<me> - current player (you)
<p0> - also current player (you)
<p1>...<p5> - members of your party from the first name underneath yours down to the bottom of the list, respectively.
I'm not sure if that's all of them, but a lot of people don't seem to know about the pc/npc ones. It really helps take a lot of targets out of the tab rotation when they don't really need to be there anyway. As for macros, here are some of mine...
Extended Boost - for MNKs, of course!
/ja "Boost" <me>
/wait 16
/ja "Boost" <me>
/wait 16
/ja "Boost" <me>
/echo Extended Boost Complete!! =^o.o^=
Provoke - WARs
/ja "Provoke" <t>
/p {Provoke} -> <t>
/recast "Provoke"
/wait 30
/echo {Provoke} {Ready!}
Cures - WHM/RDM
/magic "Cure (II,III,IV,V)" <st>
/p {Cure (II,III,IV,V)} -> <lastst>
/recast "Cure (II,III,IV,V)"
Dia - Or other enfeebles
/magic "Dia (II)" <stnpc>
/p {Dia (II)} -> <lastst>
/recast "Dia (II)"
Cheekies - For cuties/tarus
/poke motion
/em pokes <t>'s little cheekie-weekies!!
PDance - A must-have for any Tarutaru!
/panic motion
I'll put up more when I think of them... but let's see some of yours!!

*edit* : I usually leave Cure macros with <st> in case I'm fighting Undead, I can still cycle through to it. With a control pad, you can use Up/Down on the directional pad to cycle through party members, so that sort of acts like <stpc>. However, some spells like Protect are never cast on NPCs, so it's easier just to take them out of the rotation all together.