According to the wiki page of Eletania this carries over to ME2. Does it have any effect in the later games?
According to the Mass Effect Wiki the event is flagged in save-game imports from ME1->ME2. However, there is no mention of it actually having an effect on either game.
I personally haven't noticed any follow-up. I did receive the vision on Eletania, and have played through the entire Trilogy - though I haven't played any DLCs for ME3 yet.
again from the wiki, about the trinket:
This item was intended to be carried over in ME2 for a quest that was cut out from the game (source of this: a couple of posts in the bioware forums. yet, I think it's just rumors/voices running around, but it's the answer with the most sense I could find)
Other rumors (unverified, again from the forums) about ME3: it's the key for
or it just gives you a slight increase in your war assets.