This page contains information about many of the optional missions that are available in S.T.A.L.K.E.R.: Call of Pripyat. The list is sorted alphabetically - initially by the names of the persons giving out missions, and then by the actual mission names themselves (as they appear in the dialogue options). The list is currently not complete, but once I start to work on the walkthrough, they should eventually be added.
Please note that some missions might not be available right off the bat, ie. you may need to complete other missions first, or meet some other requirement. In most of these cases I've added notes to the mission description that should clarify what the prerequisites are, if any.