Bondage: Stocks
Gag: None, but if I have to choose then it would be bit
Tickling: Fingernails, Ball-End Hairbrush, Tongues (human and animal), Feathers (especially between the toes)
Bondage: Rope - it's so versatile, and a great medium to get creative with!
Gag: Socks - favored preference, though others may be more...practical. =S
Tickling: Fingernails - 'nuff said!