Searching for this info myself, I didn't find much helpful in the thread, so I've just recently started keeping track.
This includes Mesmer skills too as I'm an E/Me. Elementalist skills are designated with an *.
The top of each grouping indicates where you get the quest. Underneath lists what skill you get and who gives you the quest. If there's a second name after a slash, you have to go to that character to complete the quest.
*Magnetic Aura - Kendrick Redstaff
*Earth Attunement - Kendrick Redstaff
Diversion - Erudine
Shatter Hex - Erudine/Vassar (Sardelac Sanitarium)
Chaos Storm - Vassar
Mantra of Flame - Vassar
Power Leak - Vassar
Conjure Phantasm - Vassar
Ether Feast - Vassar
Imagined Burden - Vassar
Illusion of Haste - Vassar
Energy Burn - Vassar
*Whirlwind - Howland the Elementalist
*Ward Against Foes - Howland the Elementalist
*Ice Prison - Howland the Elementalist
*Gale - Grand Mason Stonecleaver / Rangil Ironbow (Traveler's Flats?)
Fragility - Sebedoh the Mesmer
Power Spike - Sebedoh the Mesmer
Channeling - Sebedoh the Mesmer
Mantra of Frost - Grand Mason Stonecleaver/Rangil Ironbow(Traveler's Flats?)