I’ll start:
Led Zeppelin - Heartbreaker, Rock and Roll
Steely Dan (Larry Carlton) – Kid Charlemagne
Duane Allman: Layla, Dreams
Dickey Betts: Whipping Post (At Fillmore East)
Jimi Hendrix: Machine Gun, Voodoo Child (Slight Returns)
Those may seem like kinda cliche choices… more recently, I’d suggest any number of Tom Morello’s efforts. And lest I sound like I’m saying all the best guitar solos were from 1969-1971, I’ve seen a large number of great ones recently - they’re just live, not on an album.
Another great one from Fillmore East - Stormy Monday
You can really pick any solo you like from that record. I feel like a dope for not mentioning Duane’s on In Memory of Elizabeth Reed and You Don’t Love Me.
Got a bunch–
Jeff Beck in Going Down
Page’s break intro after the psychedelic stuff in Whole Lotta Love
The solo in Reelin in the Years
Nugent’s (as distasteful as he is) solo in Journey to the Center of your mind
The guitar break in You Turn Me On (can’t remember who did it)
Intro to Money and break in Louie Louie
Hang on Snoopy break
Hendrix’s break in Red House, of course
Every note played by Peter Green
Some nifty work by Deep Purple in the Machinehead phase
and many many more
“Sultans of Swing” by Dire Straits (Mark Knopfler was the guitarist, of course), from Alchemy, the live album.
Frank Marino doing “Johnny B. Goode” on his 78’ “Live” album.
Dont know if it will count or not, but the guitar solo in November Rain… love it!
Maybe it’s cliche but I’ve got to throw in Eddie Van Halen’s “Eruption.”
Also:
Randy Rhoads on pretty much anything but “Mr. Crowley” is a stand-out for me
David Gilmore on “Comfortably Numb” (not flashy but perfect for the song).
Page on "Stairway to Heaven’
Angus on “Back in Black”
Hendrix on anything
Nirvana: Smells Like Teen Spirit
Pearl Jam: Alive
Led Zepplin: Stairway to Heaven
YES
Steve Howe
Yours is no disgrace
YES
Steve Howe
Starship Trooper
YES
Steve Howe
Going For the One
YES
Steve Howe
On The Silent Wings of Freedom
Are you kidding? That barely even qualifies as a solo.
Would Carlos Santana qualify?
Well, it’s solos, not soloists, but he’s done some work that would qualify for sure. I love some of his early instrumentals - Samba Pa Ti is great, so is Soul Sacrifice. And Singing Winds, Crying Beasts…
Would have been great: Duane Allman, One Way Out, Eat a Peach – if the bass player hadn’t fucked everything up.
Most unexpectedly wow solo: Elliot Easton, Shake it Up, The Cars. Really. 20 seconds of blazing nastyness in the middle of utterly unremarkable dance-pop.
::Rushing to Berry Oakley’s defense:: 
Which bit are you talking about?