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→Floating Bridges
If you use a floating bridge, be sure that your bridges knife edges are sharp and contact the posts at a completely perpendicular angle while the bridge is at rest. Also make sure your posts don't have notches or other imperfections that can catch or otherwise prevent the bridge from easily rotating against them. This guarantees you the greatest tuning stability. Also, make sure your locking nut is tightly locked, or if you have locking tuners, your nut is well-lubricated.
Whammy bar dive bombs are notorious for throwing guitars out of tune. If the guitar is a quality instrument with a good setup, a dive bomb shouldn't be a big issue. But if you notice you have this issue with your guitar, you may have to adjust your playing away from such harsh dive bombs in a live setting(or substitute actually whammy dives with a whammy pedal).
There are devices, such as the Trem-setter, that use a double-hinge method to try to stabilize the bridge at its desired resting position. From what I hear they work as advertised; however, they also prevent you from getting a smooth whammy movement around the rest position. For this reason, I don't like them - I find they kind of defeat the purpose of having a floating bridge. But you may find them worth the compromise for live situations.
=== Double-Stops or Unison Bends ===