For bombing techniques I have learned everything I know from Thor's Bomber Manual V2. I suck @ Manual bomb drops. I love jumping into the gunners position and fighting off bandits, but you tend to die allot back there. The gunners are great for picking up bandits in full switch servers.
For landing(B-25) I turn Final @ 1000-1500' (500m) alt and put the throttle 25%(or less, I want to coast) from a good ways out. Point the nose at the start of the runway and adjust my pitch with trim. I almost fly the whole thing to the ground with elevator trim.