Where to start.

Ok:

1: Follow Strobe
2. Broken follow warnings.
3. Auto-merchant for buying/selling consumables/crap
4. Auto-quest share.
5. Auto-free-for-all looting.

I could go on. I've happily donated to help Jafula out and plan to again.

Also - quest tracker eh? Yes, please - I'd love to make sure that my followers are all at the same stage of a quest my lead is. I had an instance where (somehow!) one of my followers didn't get credit for killing the Commanders in Icecrown (BBC quest), and he had to go back and solo it, because the others already handed it in and therefore phased out synch with him.

Now, I manually check to make sure they've all got quest credit when doing the argent dailies before I hand 'em in.