check the Complete Devine for all those feats that use turn attempts. divine metamagic has been mentioned, but i'd like to also note the feat Divine Power- basically you use turn attempts to increase your caster level by 1-4 (sometimes less, look for it for the mechanics).

i found it very usefull, from increasing time of spells, to making them more potent and so on. i heartily recommend it.

Kol.