Okay, the last moderate size earthquake here in Los Angeles had us double checking our emergency kits for essentials. The one thing we were missing were some small sized flashlights in all our bags (we have three strewn throughout the apartment for easy access). We think these three bulb LED flashlights are a fine idea for a diminutive and temporary light source...like one of those keychain lights but x3.
Just partner this up with a standard 9V battery (is it just me, or are these sort of batteries becoming more rare in use?) and you've got a light source or strobe light to signal others with (this might go into our camping/hiking packs). Available here for $8.