Here's a quick way to browse Calendar events (I still want to say "iCal") in the Finder with Spotlight. Simply enter your search keyword into Spotlight. The results are sorted by type, as usual.
Move your cursor over a matching Calendar result and a pop-up appears, showing the event's placement in Calendar, as well as other surrounding events from the day. Click any event in this pop-up window to jump right to it in Calendar.
Note that this works with iCal in Lion as well as Calendar.app in Mountai
