Rob Westcott recommends:

Educational Entertainment: RobWestcottProductions
Entertainers/Event Pros:     GigSalad
Event Planners:                    EventPlanners-Directory
Inflatables:                             BirdiesRentals
Magic Tricks:                         MagicTricks
Party Planners:                     PartyPlannerUSA
Wedding & Party Vendors:  Decidio
Party Location:                      Jumpin' Monkey