Wow, is it just me or is Divination an absolute no-brainer if you can get it? (hint: do you have an awesome army like Space Wolves or Grey Knights? Well, here is your power... cause you poor buggers really need the boost and all.) Fantasy analogue = Lore of Shadow / Lore of Life
Telepathy and Telekinesis look about tied as distant seconds. Fantasy analogues = Death / Light / Heavens, i.e. useful for armies without access to Divination.
Biomancy and Pyromancy. Meh. Fantasy analogues = Fire / Beasts / Metal. I expect you won't see these very often, except for very particular builds (Biomancy on a tough fighty psyker wouldn't be too bad, e.g. Mephy, 'Nids)
And if the Divination powers weren't already good enough, they would seem also to circumvent most 'Deny the Witch' by being cast on friendly units.