Party Photos
I have been shooting some company parties and gatherings over the last few months and find that the size of lens depends on the size of the room and type of gathering. If you have sufficient room to maneuver and can use a mono pod then using a 70-300 or 70-200 with IS will enable you to get some good candid photos. You will not be in the face of the party goers. Also you won't be using the flash much because of the distance but that makes for better stealth. I personally prefer candid photos over posed shots, so I tend to wonder around the outside walls and shoot across the room at small gatherings or zoom in on individuals.
On the other hand if the room is small and you can use a flash, something like the 18-105 will probably be the best choice.
Of course having both available is be even better.
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