This is an attempt to colaborate in the WORMS Virtual Encyclopledia
Under a general title
Optimal Path Problems
some (more or less) related problems are described.
Maximum Capacity Path Problem Fractional Path Problems Minimum CostTime Ratio Path Problem Minimum CostCapacity Ratio Path Problem Minimum CostReliability Ratio Path Problem Quickest Path Problem 
Shortest Path Problems Shortest Path Problem Kth Shortest Path problem Multiobjective Shortest Path Problem Constrained Shortest Path Problem

The idea is to keep
notation and basic definitions throughout
the entries.
Of course we hope to get a lot of help from everybody...
so
and
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