No one else ever touched the ring except for Frodo and Sam (and Gollum, that is), unless my memory is failing me.......which is entirely possible because it very often does...
Touchers of the Ring in LOTR (To the best of MY knowledge):
1) Bilbo (at beginning of book)
2) Frodo (given to him by Bilbo)
3) Tom Bombadil (Examines it and remains UNCHANGED!!!! by his encounter; which has always bugged me as to what manner of creature HE is)
4) Samwise (takes it when he thinks Frodo is dead by Shelob)
5) Golum (climax scene)
Two other mortals that can be added are Isildur and Déagol (As we learn in Gandalf's summary).
Two other mortals that can be added are Isildur and Déagol (As we learn in Gandalf's summary).