according to an analysis of word frequency done on the Mainichi shinbun a few years ago 会談 comes in as the 172th most frequent word. So thats pretty commononly used. all the example sentences on alc.co.jp seem to use it in a faily official context ie "emergency summit", "peace conference"
yep - you can find info here :
http://www.manythings.org/q/n-about.htm
They link to a file containing the frequency rankings - and there are a number of quizes based on that list.