Apple today released iOS 4.3.3 Software Update for iPhone, iPad, and iPod touch.
Apple also released iOS 4.2.8 Software Update for Verizon iPhone (CDMA model).
Both updates contain changes to the iOS crowd-sourced location database cache, including:
• Reduces the size of the cache
• No longer backs the cache up to iTunes
• Deletes the cache entirely when Location Services is turned off
The updates are now available via iTunes.
More info here.