D&D 4E apps?

[Smakian]

My gaming group and I are looking at maybe augmenting our game with some apps. These are the ones I've seen so far that look interesting, but a lot of them do the same things...wondering if anyone has any experience with these and can offer impressions on which ones are best?

DM apps:
Tabletop Initiative Tracker
DMTools
RPG Buddy
DMDJ

Player apps:
d20 Fight Club
CombatDeck
i4e

Apps for both:
Compendium
Drums of War
Power Cards 4E