Mine has to be the last 30 seconds or so from “November Rain” Guns 'N Roses.
Anyone else?
The guitar and drum section during the last two minutes of “Hotel California”.
Don’t really have a favorite, but the fade-out on the early 1960’s song “Just One Look” is probably the best part of the song. Especially in the original version by Doris Troy.
“Just one look…that’s all it took, yeah, just one look…that’s all it took.”
The outro only lasts ten seconds or so, but I can’t imagine someone covering the song and omitting it. It’s been pulled from the rest of the song and used (as a loop) in commercials.
Here’s the Hollies covering it.They make the rest of the song more interesting so the difference isn’t as great. (Warning… video contains footage of Graham Nash looking like an uber-geeky George Harrison clone.)
Ohh, and apologies for being stuck in the 1960s.
The backward keyboard snippet stuck at the end of Strawberry Fields Forever always makes me see Giggling Madness wiggling a beckoning finger my way. (“Hey, when you go out this evening why not leave the clothes at home and take the axe instead…?”)
Gary Hoey - La Rosa Negra
Les obscure,
Led Zep - Stairway to Heaven
Favorite Ending is “You Can’t do That” by The Beatles. I love the little signature at the very end. Also, “Happiness is a Warm Gun.”
The last measure of Elton John’s “Come Down In Time”. It’s a B5 chord. Song is in Dm.
ETA:
D melodic minor, not D harmonic.
I think it’s probably the end of “Night Rally” in Elvis Costello’s my aim is true. The way that it builds and builds and the stops abruptly mid lyric for just long enough to let you know the song is over before “Radio, Radio” starts.
I opened this thread intending to post this.
“And in the end, the love you take is equal to the love you make” -The Beatles “The End”
Neither of those songs was on the US version of that album IIRC.
I too am partial to the sudden end to a song, especially in a good rave-up - “Should I Stay or Should I Go” by the Clash has some awful lyrics, but everything in that song races to a photo-finish at the end and then it is over.
Well I guess the Beatles were the expert in this realm (among many others) because I came in here to nominate one more.
The coda to Hello / Goodbye is brilliant. The song could end simply enough with the last sung / spoken “Hello -o -o…” but then an abrupt change of gears and the outro kicks in with the upbeat “Hey-la, Hey, Hey, Hey-la” groove that could easily have served as the structure of a chorus for a different song all together but instead works perfectly when inserted here.
The chord that goes on forever at the end of A Day in the Life.
The bird that tweets at the end of Layla.
It’s a guitar, dude.
I love both the “endless chord” from the Beatles’ A Day In The Life, and also the corresponding satire of it from the Rutles’ Cheese And Onions (from the fictitious Album, Yellow Submarine Sandwich). Apparently, this song has actually been included on bootleg Beatles compilations by people intentionally or accidentally mistaking the song as a “real” Beatles song 
After all, you better think twice – at least once more.
Also, the end to U2’s song Stay (Faraway, So Close!): “Just the bang and the clatter, as an angel hits the ground.” short, muted cymbal (The video and its ending don’t really match what I picture the song being about, either…)
The final verse that was, I believe, left off the radio version of The Thunder Rolls. It gives the song a much more definitive ending (IMHO).
And I’ll third the ending of Hotel California
I’d go with the coda from The Police’s “It’s Alright For You” - from 2:29 to the end.
Or the end of XTC’s “Mayor of Simpleton” - 3:10 to the end.
Or the end of The Smiths’ “Pretty Girls Make Graves” - 2:28 to the end.
Here’s one I just remembered: Jimi Hendrix, House Burning Down. One of the best intros AND best endings.
The end of High Speed Dirt by Megadeth. A killer little solo followed by the sound of a jumper hitting the ground and turning into mush.
The last three minutes of “Supper’s Ready” by Genesis.
Exquisite choice.
The end of Blinded by the night (MMEB) in the album version.